extremely soft 2nd to 3rd shift

Ya, i have brought it to them with a couple other issues and i have brought it to them for there inspections they have to do in order to keep my warranty valid with them, i have never missed an appointment with them. In fact i'm sure they have seen this transmission more then they'd like lol. when they first re-built it, i took it home and there was fluid pooring out the bell housing area.... And what it ended up being was they gave me a different dip stick tube and dip stick that went behind the engine instead of next to the hedders , anyways the dip stick and tube they gave me was reading the fluid level wrong, it was accually 3 quarts over full, so it was pooring out the vent. They had the truck for a week trying to resolve that issue.
Then i brought it to them for there 90 day inspection and there 6 month inspection and my year inspection.
So I have been very compliant with them, i will just get a shift kit and schedule an appointment with them to put it in. How do the B&M transpack kits do in the A-518's? I read they are pretty good? But i know the favorite is the transgo kits, would the tfod-hd2 transgo kit be too much for what i'm after?