I have a 1:25 on my flywheel with four torque motors on one side and the motors are set to 85 as a motor value. It launches the ball about 1 or 2 feet short from the starting point.
What size wheel are you using? Make sure you reduce friction as much as possible, and make sure you’re compressing the ball enough to get enough traction between the wheel and the ball.
2 5 inch wheels
It sounds like your issue is too much or too little compression. Fiddle around and make sure the the wheels are touching the ball, but not so much that it is difficult to push the ball through.