Does anyone have a list of coins where soloing is known to be broken? Maybe one with low diff?

Phoenixcoin has low diff and the blockchain should download fairly quick for the wallet.
I find blocks in a matter of mins. after starting r54, r55 & r56 gives more boooo's than r54 that I get none in.
-i value needs to be low -i 10 is a good starting point for solo mining phoenixcoin.
at 300+ kh/s I find a block in about every 15 mins most of the time on a single GTX960.
r68 dump log
[2015-09-23 02:44:50] NVAPI GPU monitoring enabled.[0m
[2015-09-23 02:44:50] 1 miner thread started, using 'neoscrypt' algorithm.[0m
[2015-09-23 02:44:50] [01;30mBinding thread 0 to cpu 0 (mask 1)[0m
[2015-09-23 02:44:50] [01;30mJSON protocol request:
{"method": "getwork", "params": [], "id":0}
[0m
* Rebuilt URL to: http://127.0.0.1:3333/
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 3333 (#0)
* Server auth using Basic with user 'phoenixcoinpc'
> POST / HTTP/1.1
Authorization: Basic cGhvZW5peGNvaW5wYzp4
Host: 127.0.0.1:3333
Accept-Encoding: identity
Content-Type: application/json
Content-Length: 45
User-Agent: ccminer/1.5.67-git(SP-MOD)
X-Mining-Extensions: longpoll noncerange reject-reason
X-Mining-Hashrate: 0
< HTTP/1.1 200 OK
< Date: Wed, 23 Sep 2015 07:44:50 +0000
< Connection: keep-alive
< Content-Length: 311
< Content-Type: application/json
< Server: phoenixcoin-json-rpc/v0.6.6.0
<
* Connection #0 to host 127.0.0.1 left intact
[2015-09-23 02:44:50] [01;30mJSON protocol response:
{
"error": null,
"result": {
"algorithm": "neoscrypt",
"data": "02000000e2f3ceab75f7db954acf51383b48743fea1faa9f0216239bcc864ff0f1c66a0a221a2f1c9f713cd60c3d9cc41aa5fc9c5e52c37405c96a017a19442d5158802f6c580256549e071d000000003d010000",
"target": "0000000000000000000000000000000000000000000000000000549e07000000"
},
"id": 0
}
[0m
[2015-09-23 02:44:50] [31mJSON inval data[0m
[2015-09-23 02:44:50] [31mjson_rpc_call failed, retry after 30 seconds[0m
r54 dump log:
[2015-09-23 02:50:43] NVAPI GPU monitoring enabled.[0m
[2015-09-23 02:50:43] 1 miner thread started, using 'neoscrypt' algorithm.[0m
[2015-09-23 02:50:43][01;30m Binding thread 0 to cpu 0 (mask 1)[0m
[2015-09-23 02:50:43][01;30m JSON protocol request:
{"method": "getwork", "params": [], "id":0}
[0m
* Rebuilt URL to: http://127.0.0.1:3333/
* Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 3333 (#0)
* Server auth using Basic with user 'phoenixcoinpc'
> POST / HTTP/1.1
Authorization: Basic cGhvZW5peGNvaW5wYzp4
Host: 127.0.0.1:3333
Accept-Encoding: identity
Content-Type: application/json
Content-Length: 45
User-Agent: ccminer/1.5.54-git(SP-MOD)
X-Mining-Extensions: longpoll noncerange reject-reason
X-Mining-Hashrate: 0
< HTTP/1.1 200 OK
< Date: Wed, 23 Sep 2015 07:50:43 +0000
< Connection: keep-alive
< Content-Length: 311
< Content-Type: application/json
< Server: phoenixcoin-json-rpc/v0.6.6.0
<
* Connection #0 to host 127.0.0.1 left intact
[2015-09-23 02:50:43][01;30m JSON protocol response:
{
"error": null,
"result": {
"algorithm": "neoscrypt",
"data": "020000009e9408c3bdb43e00e98c4a7be4f7a3bc916192166a99c3b6bac9446c7a89d3530066c080ddfeaba4403860b0ecdc1717783955c2403c9eac01b01a6dab94f81fcd590256549e071d000000003d010000",
"target": "0000000000000000000000000000000000000000000000000000549e07000000"
},
"id": 0
}
[0m
[2015-09-23 02:50:43][01;30m got new work in 3.00 ms[0m
[2015-09-23 02:50:43][01;30m JSON protocol request:
{"method": "getblocktemplate", "params": [], "id":0}
[0m
* Rebuilt URL to: http://127.0.0.1:3333/
* Found bundle for host 127.0.0.1: 0x729f590
* Re-using existing connection! (#0) with host 127.0.0.1
* Connected to 127.0.0.1 (127.0.0.1) port 3333 (#0)
* Server auth using Basic with user 'phoenixcoinpc'
> POST / HTTP/1.1
Authorization: Basic cGhvZW5peGNvaW5wYzp4
Host: 127.0.0.1:3333
Accept-Encoding: identity
Content-Type: application/json
Content-Length: 54
User-Agent: ccminer/1.5.54-git(SP-MOD)
X-Mining-Extensions: longpoll noncerange reject-reason
X-Mining-Hashrate: 0
< HTTP/1.1 500 Internal Server Error
< Date: Wed, 23 Sep 2015 07:50:43 +0000
< Connection: close
< Content-Length: 1155
< Content-Type: application/json
< Server: phoenixcoin-json-rpc/v0.6.6.0
<
* Closing connection 0
[2015-09-23 02:50:43][01;30m JSON protocol response:
{
"error": {
"code": -1,
"message": "getblocktemplate [params]\nIf [params] does not contain a \"data\" key, returns data needed to construct a block to work on:\n \"version\" : block version\n \"previousblockhash\" : hash of current highest block\n \"transactions\" : contents of non-coinbase transactions that should be included in the next block\n \"coinbaseaux\" : data that should be included in coinbase\n \"coinbasevalue\" : maximum allowable input to coinbase transaction, including the generation award and transaction fees\n \"target\" : hash target\n \"mintime\" : minimum timestamp appropriate for next block\n \"curtime\" : current timestamp\n \"mutable\" : list of ways the block template may be changed\n \"noncerange\" : range of valid nonces\n \"sigoplimit\" : limit of sigops in blocks\n \"sizelimit\" : limit of block size\n \"bits\" : compressed target of next block\n \"height\" : height of the next block\nIf [params] does contain a \"data\" key, tries to solve the block and returns null if it was successful (and \"rejected\" if not)\nSee https://en.bitcoin.it/wiki/BIP_0022 for full specification."
},
"result": null,
"id": 0
}
[0m
[2015-09-23 02:50:43][31m JSON-RPC call failed: getblocktemplate [params]
If [params] does not contain a "data" key, returns data needed to construct a block to work on:
"version" : block version
"previousblockhash" : hash of current highest block
"transactions" : contents of non-coinbase transactions that should be included in the next block
"coinbaseaux" : data that should be included in coinbase
"coinbasevalue" : maximum allowable input to coinbase transaction, including the generation award and transaction fees
"target" : hash target
"mintime" : minimum timestamp appropriate for next block
"curtime" : current timestamp
"mutable" : list of ways the block template may be changed
"noncerange" : range of valid nonces
"sigoplimit" : limit of sigops in blocks
"sizelimit" : limit of block size
"bits" : compressed target of next block
"height" : height of the next block
If [params] does contain a "data" key, tries to solve the block and returns null if it was successful (and "rejected" if not)
See https://en.bitcoin.it/wiki/BIP_0022 for full specification.[0m
[2015-09-23 02:50:54] CTRL_C_EVENT received, exiting[0m