Possible fuel issue ?

Hi all,
I purchased another mustang. Its a 5.0 with a single turbo set up running 8psi of boost. Its all stock except for the 255-lph fuel pump up grade. The car runs great under moderate load and at cruise speeds but when its mashed at wide open throttle is seems to choke out as if were running out of fuel. Would installing larger injectors help this problem ? Any help / advice would be greatly appreciated.
Thanks

Hi, I thought the filter may be an issue too. I replaced it yesterday and still had the same issue. I was just thinking that maybe the stock injectors can't keep up with extra air, but I'm not 100% sure. I just don't want to start throwing parts at it without getting some input on the situation.

thanks.