fuel pressure is dropping at wot

if i go wot by the time i get to the top of 2nd gear my fuel pressure is dropping, its set at 50psi and it drops to at least 34 psi, but while cruising, ideling, and accelerating here and there its fine or it goes up a little bit,

for a fuel system i have a 255 walbro in tank pump 1year old, 30lb svo injectors 2years old, aeromotive afpr 2 yrs old

and according to the dyno its leaning out upstairs

i do have an update

checked fuel injectors and they are not leaking, checked regulator with engine running and vacum line on it reads 50, off it reads 56 psi

checked voltage at pump with engine running and its at 12.5 volts

i also notice that the fuel pressure drops when the key is on but engine is off. it graduatly drops from 50 to 0

You also posted on another thread on another forum that the fuel pressure was now 42-43 PSI at WOT. That's the problem with posting the same question on multiple forums, and that's why we discourage it. No one gets all the facts, and people may be duplicating answers you already have. I'm going to close this thread and move the other one over to this forum.