I have a dumb question I hope you can answer, What argument do I use to change difficulty for your pool? is it only by port? ive never used an s9 before and ive tried d= diff= --suggestdiff but non seem to stick.
S9s never supported the main cgminer code so they never adopted the --suggest-diff setting properly. However, normally there's no point in adjusting diff anyway, the pool knows best, and diff is purely cosmetic when mining solo anyway. The only reason to manually set diff when mining solo is to minimise bandwidth by setting diff up. If you really want your bandwidth to be as low as possible, just mine on the high diff port 4334. The pool won't accurately report your hashrate but it makes no difference to your chance of finding a block.