the problem is not the top end but the bottom and mid range. I can take a 7.5 and run boost on it and run the same lap times as a 4.5, BUT the 4.5 comes off the corners so much harder that if he is behind he can pass easily, slam on the brakes at the next corner and I'm left out in the cold, same with when I'm behind, no way can I pass him unless he make a mistake. and this is with the same lap times. I know your taking about slower motors then this but the same issue will be there I would think.
#49, #25a, #91, #7, #12 the ones to watch.... UPDATE. #12 is your new AMA GNC #1
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