Check the latest Rift version
Look at the newest EmberZens update notice before assuming the 2K patch changed the script.
Keep your working build
Leave your last good setup alone. Use a second saved build for any new timing tests.
Test the same shot
Use the same MyPLAYER, jump shot, controller, and test location. Change only one timing value at a time.
Write down the best value
Save the value, build, and result that worked so you do not have to start over next time.