Hi Adr_0,
System is working with absolutely no issues mate, very happy with it. Done around 10 or so brews now. Never had a problem with overshoot or anything and not quite sure what you mean. I just punch in the mash temp I want on the HLT PID and set it exactly 1 degree higher than I want the mash temp to be as I lose 1 degree through the hoses whilst the mash is in progress. Once I have mashed in I pretty much just walk away to do other jobs for the duration. Temp stays perfectly fine, maybe .1 or .2 degrees up or down occasionaly during the mash but certainly nothing to worry about.