I just put a built 6l80 in with 2800 stall, clutches are alto 1-2-3-4 and 4-5-6 (all others are stock clutches), welded baskets, new billet inter shaft, billet rotor, new pump, zip kit, line pressure booster, Sonnex 1-2-3-4 piston, sonnex 4-5-6 piston, wide filter, camaro pan (It is in a G8 and had a shallow pan). Your talking to the builder... I did have some help from friends who have been mechanics for over 20 years and I have allot of confidence that we got the build right.
The issue is I am binding in all shifts. 1-2 it is there, 2-3 is bad, 3-4 is berley noticeable but there, 4-5 and 5-6 are moderate.
I have been on the HP Tuner forums and there are not that many perople that understand these transmitions outside of minor stuff.
To add to the difficulty I added a LSA supercharger on my car with twin 450 map referanced pump setup while I had the trans out and I have it runnig on a rough tune just for part throttle driving. I dont want to work on the car much untill I know the trans is not going to come apart or get messed up for driving. I will put up a better log in a few