Alrightey then, here's my
second attempt at getting a reasonable number.
After fixing the tension issue w/ the alternator/AC belt, things went much better. Boost gauge still registered a slight drop in pressure upon vtec engagement (prior to VTEC, gauge registers a solid 7-7.5psi). The pressure, however, was kept at a constant level at around ~6psi. At the dyno itself, I saw a constant reading of ~5.5psi all the way until redline. This might explain the loss in torque in the image above. Here's a readout of the relative Air/Fuel readings:
All in all, I'm pretty impressed. The intake showed a pretty good increase (I didn't get a change to quantify it though) above 4K compared to the stock setup.
You may now flame/praise.