Ya it can take some messing around to get the idle pressure right with a big pump. But its unrelated to the return system mostly, as its a problem with how the fuel pump module re-purposes the return fuel to power a couple of restrictive venturis. But being that your car is boosted, I would have done/recommended the return system for the sake of fuel volume on top. With E85, you would be pushing it and most likely see pressure drop near redline.
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