904 slipping from 2nd-3rd (with video)

transmission has always had a 2nd-3rd. long story short i rebuilt the trans with the kevlar bands and new clutches throughout, transgo shift kit ect. everything seems to work great except it still slips from 2nd-3rd. im a loss and need some good racers advice on what i should do

car has a hughes 3500 stall and a stock mildly modified valve body

in this video you can clearly hear it slipping/slopping around

when racing someone i can feel the power loss and they creep on me until it shift and then i start pulling them again

[ame="http://www.youtube.com/watch?v=jrzGql7L5ms"]IMG 2638 - YouTube[/ame]