I'm curious if the root cause could be the frequency of the PWM signal to your fuel pump. I've never had to run a damper to have stable fuel pressure.(admittedly with a return style system) However I have experimented with PWM pump control, and the frequency that the pump is driven at makes a noticeable difference in the way the pump performs. Just an observation
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'65 Tempest 467 3650# 11.30@120.31
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