Normally the diff is recalculated every 30 seconds, so after a minute and a half you should get a stable diff for your rigg.
I you have problems with a certain coin, just notifcy me than i go check the config
On closer inspection it appears that the hashrate(and difficulty) on some of my bitfury rigs is dropping off if/when the pool's "Findblocks" status indicator turns red. Some of them are failing to recover even after the process has been reset on the pool and the hashes are instead being sent to a backup pool.
In the OP you offered to forgo pool fees for early adopters. Is that offer still valid? I like the interface and could aim significantly more mining power(THs) at the pool.