The response time of the stock injector solenoids seem to be slightly different then the response time of the RC's. I did the same with mine when I went from stock to RC 440's and cut (IIRC 63%) and then I had to tweak a bit (more fuel, I think) to get it closer to perfect. Granted, I'm running really rich, but until I get my J&S in, I'm more confortable paying a bit more for gas then for motor repairs (even though now the damn thing has natural disasters
).