Get a wideband datalogger so you can see if increasing is helping, maintaining or hurting you. Id like to know what Ed Brewers boost was in 3rd also. If you have a better than stock intercooler then the 22 psi limit doesnt apply. You could effectively go beyond it. Dumping massive amounts of methanol into the engine may aid in bringing down the air temps in the intake allowing further increases if turned up.
I think Ed Brewers boost did come down in 3rd. I talked to him for quite extensively after he had run that number. I also think he was only running a dutt neck non stretch SLIC.
11.37 was his time I think... there is an old stock turb thread that is fairly long that has his time and trap speed in it...