i've been thinking about that, and I'm wondering, removing that vacuum line, combined with a walboro fuel pump, wouldn't that make the pressure even higher than 45 psi? I know it sounds funny, but is that vacuum line providing the right amount of vacuum? is it kinked somewhere, or is is slipped off on the other side and just wedged in place? is it actually creating a decent seal around the nipples? I know those vacuum lines are stretched a little bit to seal onto the nipples, and after a while, they take that shape, and dry out, and what not, so they don't seal anymore. I've had that problem with my old coupe, it looked good, but that line wasn't sealing, so it wasn't working. I just cut the old stretched out part off, and pushed it back on and everything was back to normal.

also, on a bit of a side thought, assuming you have the ability to tune on the fly for it or something like that, if removing that vacuum line ups the pressure, and the walboro would up the pressure even more, I'm assuming that would force more fuel out of the injectors. I've got no doubt that, that wouldn't be good for them, but still, it would get more fuel in there... I'm wondering how much more fuel. If it would be enough, that might be a budget way to upgrade your injectors for a low boost build, instead of having to swap them out for SRs or something, ya know...
just a thought...