pool.mn has crazy stratum with diff switching every 5 seconds

Bsod is highly ddosed with other coins, but it is good overall.
Moving my rigs to arcpool for now, it is the most stable and has fixed diff setting.
Guys can someone help me on the right way?
I've got enough experience with mining, also with skein a long time ago..
However, i can mine all coins i want exept this skein coin. Or the miner reject 100% (yes, while using the skein kernel), other miners wont start. I tested the wolf miner (normally very good, used it a long time ago for XMR and always works fine), the sgminer (many versions) but nothign work..
Also on the gettingstarted page from pool.mn it's pointed to a asic miner tool... Only message i get while using that miner is: no usb miner found (rly? xd)
I got my rig back to the zcash algo till i get a good miner for skein.. Testing for 3 hours with zero results.
cgminer is also an asic tool but works fine for skein if you compile it correctly.
there are instructions for compiling on GitHub. basically do something like ./configure --enable-opencl --enable-skein and then run the miner with ./cgminer --skein -o stratum+tcp://pool.mn:4834 -u user.worker -p x
Regarding the other question: The diff cannot "jump" every 5 seconds as it's retargeting every 60 seconds.. And the pool aims to target your miner to send one share every 10 seconds which is ideal for a coin with 60 second block times (6 shares per Minute).