I agree with the rubber being having too much slack in it. I had a Jack in the Box that did the same thing. I used the kit of rubber rings that PBR had sent me. I put the next smaller sized rubber ring on it and it solved the problem.
I've had a couple of Hot Shots and I currently have a Big Shot and as far as draining down the outlanes I never had any real problems with any of mine. Be sure to have your game level side to side with a 3 1/2 degree slope from back to front.
Dave