I took the glass off my PRO and just checked the space between the base of the cannon and the ramp with the ball and there is heaps of room on mine, plenty of drop, so i dont know what is going on with the LE model. I will keep an eye on mine and will report if i have any change.

Have you guys used the factory bubble/leveller near the shooter lane to make sure you have your rear legs wound up to the correct height ?  
The first thing I did was to wind the back legs up and level the machine. Without it, the machine wont play like it was meant to.

But I would imagine you would have done that Mr Tilt cause you have ALOT of brand new Sterns.