Sorry it did'nt work out for you, superb pistol good luck with the sale & finding your rohm...mike...
Problem is de undersize of yr hand, just in front of the wristjoint?
If yes, quite common with the Tau 7's, cause the grip there is very short.
I had the same problem.
However, this was also partly cause of the hanging grip stance I used. I altered my grip slightly, some more pressure with middle fingers and now I can shoot a match without ány trouble. I dont feel it anymore, while I used to feel it after 10 shots or so already.
So its also some getting used to.
Wouldnt sell the Tau for it, better make a larger adjustable grip piece.
ATB,
yana