what can cause the pressure to fall down under WOT?
I have the pressure set at 42psi at idle, it climbs up to 60 or so under wot, and then it slowely bleads down to 40ish in the higher rpms...I just noticed that yesterday, i dont thnk it did it before.........The only thing i could figure out is that i was kinda low on fuel.......i dont know..

check the voltage on your datamaster logs. I had a similar problem before and it was my alternator taking a dump in the higher rpms.

Time to change fuelfilter?
Have you checked that both pumps working?
Leaks around the T fitting (intank) ?

I have a dual Walbro setup and the pump output hose was partiallly off. I don't have a race-tronix setup. Also, I've had Aeromotive fuel regulator diaphram go bad (leak). This was hard to find, but a clue is a wet manifold boost referance tube. Hope this helps.

Its more than likely one of the hoses slipping off in the tank. Check that 1st.

-B