904 soft shift

HI Guys,

We have a 904 newly built and it will not shift hard at all, it is firm but no second gear scratch. it has a TCI 122400 valve body and a 3500 stall converter. The tranny shop blames the high stall converter??? Does anyone have any ideas if this is true or is something else wrong? I think it should shift hard regardless of stall at full power.

The shifter can run in manual or auto and this is the second valve body in the tranny, with no improvement tin the shift.

Specs
340/ 904 / 323 / 28 inch tires

Thoughts?