727 Transmission issue

Ok guys in my 340 I have a 727 tranny with Trans Go Shift Kit along with a B&M Quick Silver Shifter with a Custom JD Convertor 3500 stall and a Transmission cooler and the problem I have is when the tranny is cold it shifts into all gears quick with no hesitation at all and I do shift this manually, then when it warms up with the temp reading around 170 and when shifting from 2nd to drive their is a slight hesitation before it goes into drive and then it goes in strong. 1st to 2nd goes in strong. Then when I really climb into shifting into drive at around 4000rpm's I notice zero hesitation as it shifts into drive strong and even when in drive when pressing the accelerator their is no slippage. Now I have changed the tranny fluid using ATF+4 along with installing a new filter and still hesitates. I was told that it could be a shift module giving me this problem that needs adjusted. What does everyone think the problem could be? Trans has around 22000 miles on it after it was rebuilt with performance clutches and Kevlar bands.
Thanks