On 91 that's what I would expect. Don't have 91 here.
also you should really watch your IAT's over 20psi, especially 22. you might find find you don't make the power you think you do past a couple dyno pulls, like if you were using the truck as intended.
I am running a flex fuel tune as well, of course you will love the results.
Charge air temps were ok, they did raise up towards the end of the run but only by about 15-20*. I'm sure once the truck heats up the crappy Front Mount Intercooler isn't doing its job. I didn't have that issue on the dyno but it was fairly chilly in there.