The Fast supplied pump is an external pump. Have you noticed if you have this problem with a full tank of gas? Sometimes the stock in tank pick-ups will uncover under hard acceleration and starve the pump.
Along with what Jody said, check the whole fuel system from pick-up to injectors. Do you have the pressure set properly? Typically it is 43psi with the vacuum line unhooked from the regulator or the engine off with the power on to the pump. This has to match what's in the controller as your pressure.
One test to do when you are hammering it. On the hand held controller, go to the live data and look at the injector duty cycle. If it goes over 90% while you are on it, you need more fuel pressure.
Just a few things to look at. Good luck.
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