Prusa X-Carriage to GrooveMount Interface Plate

My Prusa X-Carriage is very flimsy because of all of the cutouts for various extruder mounting options. When I printed it from the git repo I should have turned a bunch off to make a more solid carriage, but once I glued it in I decided to live with it. Also, my extruder has a big motor and it's perched on a narrow, printed GrooveMount adapter http://www.thingiverse.com/thing:7107 . I never used the MakerGear adapter because it was cut off-center (for an original Wades). While testing out Ma