could the intake be holding my low end down?

Hysteric said

I'm currently at 200 psi on premium and no indication of detonation.

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Addendum for street use;
170psi, now we are into aluminum heads, and things are heating up
180 is 87E10 friendly to save you several thousand dollars over the life of the engine, and incredible throttle-response, great fuel mileage is also possible.
190 is AJ approved,for best pumpgas, and makes a tire-eating monster. It may run on 89
200 is the Mitch-approved, probable limit for 91pumpgas. I haven't been there, cuz honestly with a manual trans,IMO; there is no way to tame it with street gears; 185 is tough enough, and cannot, IMO, be done properly with just a dizzy. If I were to try it, I would want a stand-alone timing computer.
There are only a handful of FABO fellows who responded to a question I posed a year or two ago, that dare to run this high, and reported success.