Daniel:
In answer to your question, the slide leaks ONLY when it is out; dry as a bone with it in. I also recall in the thread that your dealer thought the factory slide seals were small and inadequate, and was going to replace them with beefier seals used by Trail-Lite on their bigger trailer slides. Did that happen and make a difference? Also, what is the bottom line you have found for the reason the slide "tips up" when cranked in fully and "tips down" when fully cranked out? These actions certainly change the level plane of the slide in relation to the body of the B+, affecting both the levelness of the jackknife bed and encouraging water on the roof/in the pan to run in rather than out.
Your comments are greatly appreciated. It's in to the dealer this week, and I may look to see if a slide awning would be a good idea if Trail-Lite cannot come up with a fix for the seals/wipers.