I'm cross-posting this from Tech because it wasn't getting much attention there. Maybe someone here will have an idea. I've had this rear hub for a few years now and it's developed a problem where I'm guessing it's getting some friction built up in it because when I'm going fast and coasting the chain will start to load up above the chainstay and start to sag while the length of chain along the bottom will tighten up and stretch the rear derailleur out. It obviously gets worse when I'm coasting and then backpedal. Also the smaller the cog, the more the problem shows up. It almost never happens in the largest cogs even if I'm going kinda fast. The Stealth hub uses some sort of clutch packs I believe...I actually have no clue how it really works, but it's instant engagement and worked really nice before so I'd like to figure out what's wrong and how to fix it...plus it was really expensive. Thanks.