In my limited experience with my Espar, the thing that bit me on the a$$ was fuel of poor quality.Wanted to update this so it wasn't left as open ended.
I have about 10 hours run time on it when no issues. All of that run time has been below 4k feet. I probably wont be back to an elevation where I need the H kit for a few years. Hopfully the corrections fixed my issue, but not enough run time to know for sure.