Fuel needs

If it doesnt go lean,How is it an issue? You didnt say it went lean. As long as its putting out the volume, 4psi shouldnt be an issue. Do a volume test and make sure it delivers enough fuel for your horsepower level. If its good; fugetabowdit.
Oops, for a streeter, fugetabowdit. Youre almost never at WOT for more than a few seconds at a time.