How to make a catapult stronger

I was wondering the best way to make our catapult launch higher and farther. I have seen multiple catapults shoot from mid field and I can’t even get it into the basket from up close. Any suggestions?

Could you post a few pictures, so we could see what the problem may be? Preferably a picture of the catapult:

  1. pulled back
  2. In the post-fire position
  3. Rubberband positioning
    Also, how many rubber bands do you use on either side?