I don't really have any problems with my 4200, but I have seen some posts about tuning making them 'better' to drive. What exactly do you edit?

One slight thing I did notice was that once my verter locks in 4th it feels very tight as it should. But then somewhere in the 3000-3500 area as I'm inching up there(not enough throttle to make it downshift) it feels like it unlocks again. I can feel it being looser. Maybe it's how it supposed to be. Is there anything in the scanner that says whether the verter is locked or not?