How have you determined it's running excessively rich?
No, the stock FPR is not adjustable and adjusting the pressure would just be hiding an existing problem.
Is it rich at idle? While driving? At WOT? And again... how do you know its running rich.
What else have you tested? Coolant sensor? Plug wires? Coil(s)?
BTW, the SAFC setting will need to be tailored to your specific vehicle. If it's a stock system you're usually wasting your time but you'll still want to be tuning it on a dyno. With the SAFC installed and all setting at zero there should be NO difference in how the engine operates.
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