Beautiful job with this and thank you for sharing it! I'm testing it on a 13.5TH S9 and am curious, how many errors are too many?

I've gradually stepped up the frequency from 675 Mhz and have found that some are dramatically less efficient than others. I let the machine sit for 1-2 hours on the pool to get comparative hash reports. If pool and S9 gui are 2+ TH off from each other (pool always less), I immediately try the next frequency. What else should I be watching?