If I have to I will do it this way but unfortunately I do not have a smaller craft to use for this so I was hoping that maybe the factory may have a set specification for this.
Boats under canvas so I can't get you accrate measurements now. However what I did was to go to a dealer that had a used 2120 and measured the water line from various points. You usually can see a slight scum line and then determine if you want to raise or lower it or leave it as it as is on the used boat.