Can I Keep my 30's and lower the fuel pressure?

Alright, this is about my Black GT in sig...it has 30 lb injectors, which I know are too big, but it was supercharged. I probably would be better off w/ 24's, but could I just keep the 30's and lower the pressure? Right now, the pressure is at 38 psi vac off and I have to hold the gas pedal for it to start (running rich, right?). I really don't want to change injectors simply because I don't want to spend the money if I don't have to. I'm going to play w/ the pressure when I have time, but thought i'd throw this up before-hand. The idle problem could be a timing issue as I had it idling well, but tightened the dist. back down and put spout in and it'll run for about 10 sec and die. I've checked timing half a dozen times and it's at 12-ish*.

70 mm MAF sensor. I'm not positive that it's calibrated for the 30's because I bought the car w/ it on there, but i'd assume it was. I thought MAF sensors were calibrated for injector size only - didn't think N/A or Forced Induction came into play? It's not supercharged now. I have not pulled codes, however I was thinking about that and I will try to do that ASAP. I forgot to mention that it still has the FMU on it from the supercharger, but as I understand it, the FMU only kicks in during boost, so that shouldn't cause problems like this, right? I plan to pull it off, but i'd like to have the car running well if possible and then pull it off as to not open my range of possibilities even more.

I really am not sure what type of MAF it is. I bought the car with this stuff, and didn't get any paperwork or anything. I looked and cannot see any brands or anything on it. I ran the numbers on the MAF through google and came up empty - but one time, I thought I did that and found out it was a 70 mm MAF. I'm not sure what all it's calibrated for, however. I dropped fuel pressure as low as it would go (40 psi vac off). I'm not sure why it won't go lower, but that's where the screw starts to come out of the FPR. I started the car up and the first 2 times, it died right off, but the 3rd time, it bounced around and jumped from 1000 rpm down to 800, then 700, then 600, and I made sure to keep it running. Ran it at 2000 RPM for a couple min to warm it up to pull codes. Realized the SPOUT was out, put it back in and the car still ran the same. I tried to pull codes w/ a paper clip and the check engine light and nothing happened, so then I used a test light and still nothing, so I don't know if it just doesn't work or what. Shouldn't it say something if there are no codes?