Set your pressure to 39psi as already suggested. If your MAF sensor is calibrated correctly you should be getting the correct amount of fuel when it matters. Dropping your fuel pressure so low will definitely mess up the injectors' ability to atomize the fuel which will just make your problem worse. Remember that when you set your fuel pressure that it is the high limit. If you set it to 24 psi it could go as low as 18 psi which would be ridiculous.
After setting your pressure, you also need to give the computer plenty of time to adapt so that it can deliver the correct amount of fuel. Start by resetting the computer when the car is warm and then let the car idle for about 10 minutes with accessories off. Shut it down, wait a couple minutes and the start it up with all accessories on and let it idle for another 10 minutes. When that's done, go for a long drive. Drive 50 miles or so before you try to got at WOT. This will keep the computer in closed loop giving it time reconstruct the fuel tables.
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