Sounds like you have a good start on equipment!

What ECM/PCM? Mask ID?

No reason to run ancient WinALDL when you already have TunerPro RT, it will do a more detailed data log.

Not sure who told you to change BPW in EGR? You don't even have EGR? Make sure you have disabled the EGR properly in the bin because there is no data in $42 to tell if it's on or off... but still changes fuel and spark when it thinks it's on.

First thing I'd do is search the site for the Vortec Head timing tables Dave W did for us in a spreadsheet and get it in your bin. With that and maybe a few more degrees at idle area, you don't need the extra 4* at distributor.

Here's a greaqt writeup on how to adjust your fueling from BLM data.
http://www.gearhead-efi.com/Fuel-Inj...E2-Fuel-Tables

21" of vacuum is great at idle! The hesitation is due to the Vortec headsw as well, will get better with proper advance but still needs sometimes 200% more AE to get rid of the hesitation when accelerating.

That should get you going...