poopstang, I won't dispute what you're at, so if you think you're at your fuel limits, maybe an adjustable FPR will help. Your initial message, though, doesn't really fit with a fuel starvation issue. You'd be hitting your limits at high rpm, not low rpm.
Have you replaced your O2 sensors recently? If they're not working properly the computer could be incorrectly adjusting your air/fuel ratio.
exgmguy, since you changed your fuel pressure between runs, it's a good bet that your computer has adapted by now. What more likely has happened is that the computer was adapting from run to run to get the most power.
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351W 89 Mustang GT Convertible