ORIGINAL: 46u
What fuel are you running not only brand but also all so blend? This has a LOT to do with temperatures!!! I have quite a few engines with 8 plus gallons on them still running well, running temps between 240 to 280. I do not tune to any certain temperature but by performance then check to make sure the temp is with in range.
Byrons 30% race 11 or 12% lube. I also do not tune to a temp, I do the same thing you described.