Are you using this in HLT, BK, or both? I am still fairly new to my pid and use it for both HLT & BK. If you are using it just your your HLT the default values after doing an auto-tune seemed to work fine.
If you are using it in a BK I changed my cycle rate "t" to 1. The rate was at two seconds which seemed to pulse the boil to much. I was running at 77% which would have power on for about 1.5 sec and off for .5, this would cause too aggressive of a boil then down to almost nothing. I also had to change my proportional constant "P" to one, otherwise the cycle rate would not go below two. Then I had to raise my derivative time "d" to 225 because it was overshooting the set value. Now I get a good constant boil at 70%.
I am unsure on the RTD as I have a thermocouple. I did have to change my input offset "pb" to read the proper temperature as it was off just like the post above. The only thing I didn't like was the temperature offset is not linear. This may be different with a RTD. Mine now reads spot on at 165 degrees, but on the low end, say actual temp 50 degrees it reads 55, and on the high end, boiling water it reads 215. If an RTD would correct this problem I may change.