80 -100lbs fuel pressure is because of the build up of pressure at the injectors. You have a higher flow fuel pump, but the injectors cant keep up. I ran into this same problem, had 24lb injectors with my vortech sc running a t-rex pump and a bigger in-tank pump. All i did was change the injectors to 42lb, and the fuel pressure never goes over 50 lbs and i am currently running 14lbs boost. I am not saying this is your problem though, because my car ran fine with the high fuel pressure. I would suspect it to be computer related, maybe the wrong info being read from the mass-air flow or a different sensor at that 3rd gear wot situation.
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