47re just built with problems

[Suicide diesel]

just had my trans built and daily driving it shifts fine could shift a little stronger IMO but when i put the slicks on and run it at the track it hit first and second gear and when it trys to shift to 3rd it hesitates for at least a full second and then hits hard into 3rd but it only does it at WOT any help is appreciated

99 47re
suncoast omega 3 trans kit
transgo shift kit
valair billet triple disk stock stall
billet flywheel and input
gm governor pressure solenoid