So i ran this miner for 24 hours.
It displays MUCH higher hashrate in the miner interface but is actually giving much LOWER hashrate on pool side.
So yeah dont be fooled by just whats shown in the software. Verify always pool side.
Was just noticing a similar variation myself.
dstm shows about 940 sol/s on the dual 1070 test rig, and shows ~940 pool side.
bminer shows about 970 sol/s on the same test rig, but shows ~700 pool side.
If I watch the running graph for my hash power on the pool, the line declined slightly at the time I switched from dstm to bminer, then went back up when I switched back to dstm.
Test rig running 2x asus 1070 duals under windows 10, afterburner set to +100 core +500 memory at 80% power, mining zencash at luckpool
I tried it a couple of different times for an hour each with an hour of dstm in between. Not the most scientific testing, so take it with a grain of salt and do your own tests.