Well, I cant see any leaks after pulling the rail off and testing it as you mentioned.
One thing I DID notice is that the return line (the metal portion that you attach your return hose to) from the FPR is a bit crushed/bent. Would that cause enough back pressure to force out more fuel through the injectors, thus causing it to run rich? My brain is telling me yes, but I wanted to get an opinion from someone who has more experience with this. IMO, it would be like its acting as if you had cranked up the pressure on the FPR (due to back more back pressure because of the constricted return line).
If not the case, then I'm pretty much back to square one (minus the fact that I have crappy injectors...but thats been all along...)
Pics of the FPR:
