What efi system is best for a 4.5 pfi cadillac engine7

[S.O.B.B.]

Hello Dave w.can u or anyone else confirm something. I am using an older $42 xdf and have min temp for egr to max.do I have it backwards. Should I have it set to minimum to keep egr from being comanded on.I used the bpw calculator to come up with 144 and I've gone from .4 to .49 on injector bias and still using the 45lb/hr injectors at 11psi. My logs got better but I'm still lean at above 50 kpa map.raising injector bias has gotten my blms very close to 128 at 30 and 40 kpa.but my ve above 60 is higher numbers than desired. 96 and still 150 blm in some areas.how much can injector bias be raised b4 it causes a problem.I haven't had the time or weather to change to the 49lb/hr injectors yet.any pointers are appreciated. Thanks.I've been ok reading and figuring out most of the issues I'm having but it's awesome that so many good folks on this site are willing to help.I'm hooked for good