how much is dev fees at these miner???
optiminer just updated the changelog on his github repo saying it's 2.5%Version 1.6.0 released! 
[1.6.0] Asm support for GCN 1 devices.
[1.6.0] Reduced CPU utilization.
[1.6.0] Fix segfault on reconnect.
[1.6.0] Version and Os exported in monitoring.
Speed increase about 3% for newer cards, the GCN 1 cards should see a much higher increase with the asm kernel now.
[1.6.0] Asm support for GCN 1 devices.
[1.6.0] Reduced CPU utilization.
[1.6.0] Fix segfault on reconnect.
[1.6.0] Version and Os exported in monitoring.
Speed increase about 3% for newer cards, the GCN 1 cards should see a much higher increase with the asm kernel now.
5% increase on my stock rx 470 (xfx true oc) on ubuntu 14.04 with amdgpu-pro 16.50 (netting me roughly ~262.5sols/s now, compared to ~250sols/s with 1.5.0)
Just as a side-note, i setup 1.5.0 when it got released and never had to reboot/restart any rig (hardware or software).
Just upgraded my linux boxes to 1.6.0. Looks like a solid and reliable build so far. Getting an increase across the board. At -i 7 cards are doing:
RX470 8G - 288
Rx480 8G -301
Fury X - 452
Fury Pro - 470
R9 390 - 365