J/30 Class Association Forums J/30 Forum One Design Class Rules Mast Step Postion

Vic. That is legal per class rules:

5.7.3 Position of the mast shall be fixed at the deck 3505 mm plus or minus 13 mm from stemhead tip to the front edge of the mast. And it shall be permanently fixed to an immovable mast step so that the forward edge of the mast is not less than 25 mm aft of the forward vertical face of the molded step in the sole liner.

You are more than 25 mm aft. Effectively this moves the top of the mast forward. Not optimal tune. Read comments in this thread