Bandit,
Welcome to the forum...
Your current tune file is GM OS 12212156...
Here's a plan:
1. copy/edit various tables from Bruce's tune file;
2. use the spreadsheet to calculate your IFR table;
3. increase trans. shift pressures (see images);
4. install your wideband and verify that it reads correctly;
5. do the AutoVE tune procedure (see AutoVE tutorial);
6. at this point you're in OLSD, see how it runs (MAF-less);
7. install COS5: showthread.php?p=52999#post52999 post #228, see how it runs (MAF-less);
8. tune idle: showthread.php?t=4661
9. tweak shift points and shift times;
11. install MAF and auto tune MAF table (similar procedure to AutoVE tune);
Edit: There might be other steps to insert.
Sounds like a lot, but you should be able to progress thruu all that quickly.
Some tables you can copy from HPT to spreadsheet and then into EFILive.