Don't get too wigged out about errors...it's a normal part of mining with antminers, even here on the kano pool.  I just try to keep my error percentage at double zeros and these things will run for weeks on end with no issues.  I have 7 S7s with error percentages ranging from 0.0009% to 0.0055% with my two best S7s being Batch 1.  Run at stock speeds and keep your temps right around 60C-70C by lowering your fan speeds (or raising them if you are too warm).  This will help your errors to stay down and your hash rate to stay up.  (Your fan speed always should be set to manual in case you lose your internet connection.)