So i have about 14 rigs that have problem with new 1.6 and 1.6.1 optiminer. 1.5 was working nice. Claymore is working without problem. I think that 1.6-.1 destroyed some of my risers. After 10 h mining with optiminer (with watchdog to restart) is no way to run rig without problem.
Rigs:
6 x RX 480 G1 gaming
6x RX 480 XFX RS
6x RX 480 XFX GTR
3x 5x RX 480 XFX Reference with backplate
7x 5x RX 480 Sapphire Reference
H81 pro btc
SSD drive
1600W psu

I was swithed all rigs to Claymore. Can you add v1.5 optiminer as miner option? Its 280-290 Sol/s, but work stable for me.