Start with 10 ms changes
If the shot is clearly early or late, move the timing by 10 ms. Keep the same MyPLAYER, jump shot, and saved build while you test.
Finish with 1 ms changes
When the timing is close, adjust it 1 ms at a time. Take several shots before deciding whether the new value is better.
Change one setting
Only change one thing at a time. That makes it easy to tell which change improved the shot.
Save the best setting
Put the best working value in its own saved build before you start testing another jumper or timing mode.