If your basket holds pressure, than it can only be a couple things causing pressure to drop:
1: filter clogged
2: fuel pump output too low (out of steam, defective) or wiring for it is not keeping up.
3: regulator bad
4: out-running the feed plumbing on the car, pressure dropping at high demand
I always ran a static pressure of 52-53psi in my car, no vacuum/boost reference.
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