Disklavier

I have a number of pieces, programmed on a computer, that are in the final stages of production. Problem is the Mk-IV defaults to 80% velocity. This in turn ruins the velocity output, especially on soft passages. I can always Copy the piece and save it to a new folder and then it is permenantly set to "thru". But, it would be nice to just include the Sysex, if there is a setting for that.