I'm running a very similar setup.
Lift pump into a 5 litre surge tank, twin 044's into standard feed and return, into fuel rails, -8 out of the middle to reg, -8 back to surge, -6 back to tank using the standard fitting.
Absolutely no issue. I have a fuel pressure gauge which reads from the FPR. All seems happy. Has been like that for almost 4 years.