I'm currently running stable actually

, giving me an average of 63Gh/s, with the following options. --bmsc-voltage 0830 --bmsc-freq 0982
Using the cgminer version from bitmain, february dated and a cleaned up U3 with a new power supply and new usb cable.
Note that this is just with a single unit attached. With another at the same time both units are really unstable. The other working unit i have is unstable alone as well though...

Going to try a raspberry setup with the other units now, just got it delivered, but minera takes forever to download.