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I was going to suggest fuel pump wiring until you mentioned the GoPro detail. By now it's more than normal for oem 30 year old S13 wiring to fail to supply ~13v to the fuel pump making it fail to keep the needed pressure under load. It's easy to miss undetectable when setting base fuel pressure at idle because under load is when it fails to keep the needed pressure.
I feel that shit like this is why sometimes the haggard cars (i.e. diy sketchy but newer/thicker fuel pump wiring) are sometimes more reliable than the ones we try and keep original.
...But you already checked that.
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WTB SR20 *Non-Rep* Bottom Mount Manifold
WTB Bride Zieg II
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