I wouldnt say I'm experienced by any means, but Ill try to answer your questions....
1. Yes, I did fix the idle problem, I drilled the feed hole for the IAC out to about 3/8" and that resolved it.
2. & 3. As to the fuel table. I set stoich to ~9.8 per NicD (the premiere LSx tuner in AZ) and the car ran really well right off the bat. I was using a DynoJet Wideband commander and when the gauge indicates 14.7 it is registering lamda regardless of the fuel. @ WOT I was running about 11.5 on the wideband, probably a little on the rich side, but I was undersized on the injectors and wanted it to be as safe as possible.
4. I believe my tune is posted on here, but can post again if you want, I never got a chance to make the necessary changes to the tune as far as timing goes, but I tried adding 4* to what I had in teh tune via VCM scanner on one pass and saw absolutely no improvement in ET/MPH. Then again, it could be a result of my combination.
5. It was easy as once stoich was changed the fuel trims kicked in and kept things in like +/-10% at most, probably mostly a result of my car not having been street tuned.