Regulation prior to the fuel rails is a good idea. Send only the fuel you need to the engine compartment.
Another thing to look at is the number and type of fittings you have in the entire circuit. The more fittings (especially if they are 90deg) and the more tubing bends you have the greater the restriction. This may be contributing as well.
My question about the routing was aimed at the lines and their proximity to your engine/trans and exhaust.
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