I know the path of the intake, but AFTER the MAF, there are PLENTY of potetial leak areas...it is a supercharger that puts excessive pressure on the intake system path all the way up to the top of the piston, correct? Now, with all the one-way valves, vacuum lines, 6 intake ports, upper and base charger gaskets, a rear and front nose gasket, not to mention 12 valve seals, of course throw in a leaking throttle blade shaft and/or gaskets....and you present quite a few points of possible leaking...yes? All of which could be showing boost, but never making it to the cylinders. Highly unlikely, I know, but considering some of the buzzards I see go thru the auto-auctions these days, it wouldn't surprise me. I can't tell you how many T-Bird SCs I've seen go thru with orange silicone ooozzzing out the covers from a tacky "rebuild". Some of the SSEi chargers are the same or close.
It'd be nice to know for sure the problem, as I'll NEVER be convinced a faulty MM was the DIRECT issue. At least you fixed it!!