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New fuel filter went in. Could still blow through old one, gas was nice and clean.

Put fuel pressure gauge back on rail, took car for a rip. Couldn't get more than 60psi on the fuel gauge when trying to boost, and also noticed that the bucking was occurring in relation to a drop in fuel pressure on the gauge.

Returned home, and tried to "deadhead" the pump by pinching off the return line. After pinching the line for 3-4 seconds, pressure started to climb steadily, but not by any means quickly. It reached about 70psi and called it quits. (And no, I didn't hold it there too long) and releasing the return line instantly returned the gauge to around 49-50psi at idle.

Weak pump?