found same issue, have switch back CCminer 2.2.5,even slower hash rate at local side, but higher accepted share and hashrate at pool side,have compared with 2 6x1080ti rig with same setting and pool and time.
hope they can fix this in later.
it is absolutely necessary to adjust the difficulty according to your hash, the difficulty for a rig of 6x1080 TI should't be the same for a rig of 6X1070, so you have to adjust the difficulty according to your hash. we recommend to adjust the difficlty manualy and doing the same for intensity according to GPU perfroamances and machine resources.
even if you have an ASIC with 15GH/s and low difficulty you wont have this hash in the pool.
Hoping that's clear !
OurPool team