There should be an inch or so left in the spring travel during a full launch, you can use a short piece of rubber hose cut in a spiral and slipped over the shock shaft to tell how much it has moved after a good launch. Do both sides because they will be different.
Why not move the bar to the highest position?
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo