Blow through problems

[Supervette]

This is my first blow through system. I have a procharger D1sc with a 12 rib setup running 12 lbs of boost. When your crusing around town it feels like its surging. Or like a bad miss that never goes away, but when i get on the throttle it smooths out??? I have 15 degrees initial, and about 33 total. I know the timing is right on par. My compression is about 8.25 to 1. my jets could possibly be to big 80s and 90s. It ran find on the dyno but they had an MSD digital 7 and i only have the 6 could that be another reason they could go in and program the curve and i can't. Can they also lean the system out with that digital 7. Cuz i think im running way to rich right now. Any feedback would be awesome.