Good points. Guess I should have given some more background:
I have have 3" DP, PLOG, intake, plugs/wires, and that's about it. I am using HP TUners to tune and data log. Right now, with my stock 3.8" pulley, I am seeing up to 77% injector duty cycle around 5,500 - 5,700 RPM. Just seems surprising to me that a lot of people are able to drop to 3.4" pulleys without running the stock injectors out. I remember throwing a 3.5" pulley on my other 99GTP last year and was already seeing every bit of 85+% duty cycle on my injectors around stock shift points/RPMs.
I am trying to decide if I want to go with a 3.4" pulley if it will mean running outside of what my stock fuel system can safely handle.