Fuel Pressure Regulator Vacuum - 2.4L

I had my fuel pressure checked to try and hunt down why I have hesitation. I found that the pressure was very high, at 44psi with and without the vacuum hose attached to the regulator. Does anyone have a pic of exactly where the vacuum hose should go from the regulator? I've had it on the chamber at the beginning of the intake, which had very little/no vacuum. I really don't get that setup. As far as I know, that chamber is just for noise reduction, and is not for vacuum. Yet, every picture I find of a 4cyl Tacoma engine has the hose attached at that chamber. Is there some slim chance that my regulator is bad? The fuel filter is new. I've tried injector cleaner with no change.

The hesitation during acceleration is much worse when the engine is cold.

Now I have it split onto the power steering vacuum line, which has made it better because the vacuum is much stronger, but I still have the issue.

 

Unfortunately, I'm a poor grad student, and I would like to be reasonably certain that the regulator is the problem before I spend $80+ to replace it.