your temp gun might be off, I would get some one else that has a raytek (or one like them) to check it, I had a ofna PCR temp gun and I got a raytek and the ofna was any where from 10 - 30 degrees off.

or you can put a drop of water and it should boil off in 2 - 3 sec, if longer then you can lean it out a little, if sonner then you need to richen it. I had a Force 26 I couldn't keep it under 300 and thats running as rich as I could and it stay runnning, and I only got 2 gallons ou to of it.