Yeah I have bumped up the shift firmness by 15% on all shift points and it makes a WORLD OF DIFFERENCE.
No more car like shift, it actually feels like a truck quick firm shift.
I had mine on level 3 for quite awhile and I liked it but it was hard to keep my foot out of it so right now I have it on the fallowing:
Level 2 - Towing tune
Speed Gov. set to 150MPH
1-2 shift FIRMNESS - 15% increase
2-3 shift FIRMNESS - 15% increase
3-4 shift FIRMNESS - 15% increase
For everyday driving it does great, some times if you get on it just a little the 1-2 shift is firmer than you would expect but it works great at WOT and for Towing.
The main reason I bumped it up was due to the fact that I do A LOT of towing with it, and those quick firm shifts make such a difference wether it be off the line from a light, or hitting passing gear on the freeway.
I would HIGHLY recomend upping the shift pressure not only for the performance gain, but also for the prolonged life of the tranny especially since you are running larger wheels/tires.
It will make your truck feel completly different!