P2pool works.

Pools were selected from
http://p2pool-nodes.info/If there is a specific pool, you want a try, please let me know!
A screen of an S4 connected to a local node for
one minute is hardly proof that it "works" - it's just proof that it's connected. You said the S2 "works" with p2pool also - but it doesn't, not efficiently anyway. Can you post some stats please? Better still, point one at my node for 10 minutes & we can see for sure:
stratum+tcp://iyftech.zapto.org:9332
Thanks.