extremely soft 2nd to 3rd shift

I will back the throttle valve cable off a little bit to where it shifts into 3rd without having to back off the throttle, The owner told me that i could adjust the throttle valve cable to my liking and that i could service the transmission fluid and filter without voiding the warranty. They only require a 3 month inspection visit and a 6 month inspection visit and a year inspection visit and a year and a half inspection visist wich is coming up this next april. If you miss those inspection visits your warranty is voided, they drive the truck and drop the pan and check on things during the inspection visists.
But i will get a shift kit and and make an appointment with them to install it and go from there. Thanks for the advice guys. Any advice on what shift kit to look at would be appriciated to is the tfod-jr a good kit? how much more aggressive are the shifts with one? I was looking at the tfod-hd2, would the hd2 kit be a little to aggressive for what i want?