Hi Mike, What is the pressure rating of your electric pump? Is it in the low range? Also, what pump are you using and what regulator are you using? I have found those "round dial style regulators" where you set the dial on a number to be problematic when using today's gas. However, if you have used one before and it worked well you might want to install a new one rather than redesigning your fuel delivery system. You've already had a long battle with your brakes. Buy 2 regulators and keep one as a spare.
https://www.summitracing.com/parts/MRG-9710?rrec=true
I use the Holley low pressure regulator and a FACET pump.. Here's some interesting info. on Facet pumps. Notice the low pressure pump # 40163.
https://www.aircraftspruce.com/catal...facetpumps.php
The bottom line is this. Since your fuel flow was fine prior to your regulator going bad it seems that you best bet would be to install a new regulator that will tolerate modern fuel. Call Summit and ask them if their regulators can tolerate modern gas. Also, add STABIL to your gas.