The tees have a large bore and shouldn't be an issue for my riding. I connect all the vents and run a single line up to the airbox. I haven't had any issues after falling over on a hill (with the bike on it's side, wheels uphill).
When you look at how very fine the slide stop screw thread is, the slide is being moved extremely small amounts to make idle adjustments. The JD red needle should minimize pullover (assuming the needle jet bore is correct).
I am thinking that the slide screw spring pulls the screw back centering it on the thread pitch. The slide closes pushing on the screw and after a bit, the screw moves to the side of the threaded hole. This allows the slide to drop that extra thou or two, enough to change the idle speed.
A heavier slide spring might push the slide to a more reliable "home" position. I suspect the lack of sealing compound is letting the screw move.
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2011 EC250E
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