904 Lockup Transmission Adjustment Help needed

It was a transgo TF-2 shift kit it shifts kind of firm on its own from first to second and then it shifts firm shifting from second straight to 3rd lockup if its over 30mph...Sometimes if I do shift it manually, it will be a more firm shift, but...If i drive it easy, the earliest it will shift into 3rd is 27mph (which also seems early to me with a 2.76 rear and a 26.5" tire, so I would like to fool around with a kick-down stop, because the adjustment is maxed out...) and when the car climbs to 30mph it immediately locks up too early. That 3mph range is the only time i see it out of lockup. If I could, Id like it to kick in at 45-50 mph truthfully...that would be the best time..Even holding the kickdown down a little farther just delays the gear and not the lock up feature it seems...I know the transmission internals are good, but what should I do or look for?
Thank you,
-ANTHONY