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I know my short times from both converters should have put my truck into the high ten's but I also deal with "catalitic converter overload protection" mode due to the OEM pcm which dumps in fuel at wot and I have no controll over that. Not yet anyways.

You answered your own question right there. No way that 11" is that loose on the top. It's out of power, fuel? I could be wrong but I'll bet the 9.5 is to loose with the boosted combo. It's blowing right through it. The 11" with no fuel cut off and it'll fly. Thats my guess.
Doug