I have read that before the days of computer design, they ( Mr. Pipkorn / Hydrostream) would design a hull then take it to the lake and test it, then pull it out and add, subtract or change the pad and hull, put back in the water and test again. Once they got it right they made a mold of it and started production.
It would be a gamble if your pad mod would work on first try, or you would have to add, subtract or change.
Jeff extended the chine/stakes on his GT150 all the way to the stern as did a friend of Doug's on a C500, but they haven't tested there mod's yet.
When I got my CV, motor was all the way down, 40 year old sloppy cable steering and a 20P Laser II prop, it would run about 50 MPH/GPS and didn't have any problems, but after testing a 21P Ballistic prop, which got boat over 50 mph I got very bad chine walk, and crazy amounts of torque steer. But after lifting motor, Baystar steering and 22P Laser II prop it work very well above 50 mph. You still have to balance it, as wind and waves will get it to rock back and forth, but not what I would call chine walking. Small steering correction will bring it back.
Is your 140 a powerhead or prop rated motor ?
You could set up and prop for the 50 mph range and not have any handling problems.
For water skiing I don't think you'd want motor lifted to high or you'll blow out in turns.
I've never pulled a skier or tube so can't comment.
