Bill, I have a friend back there with a slammed Tige 20V who usually rides pretty regular on Hillsdale Lake (1-2 days/week depending on work sched as he's in concrete/construction), that is until his third left town. He doesn't frequent this site (I don't know why) but I sent him an email with reference to this post. I don't wanna give you his contact info without his say-so.
Like Sarah said, the cable is good too, and there are usually boat owners there (especially on the event days, which KC has a lot of) you might be able to hook a pull up with. Another good option is to get in good with the boat dealers/pro shops. They usually keep up with everyone they've sold to, where they ride, and know of their clientel who would be willing to pick up a third or extra riders. Give them your phone number and tell them if any of their customers are needing a third to give you a ring.
Best of luck, I'll soon be going through the "finding boats to ride behind" excercise as I'm relocating for work, AGAIN... Just when I had three guys with Mastercrafts lined up to ride with 2-3 days a week.