The e13 from descent gear is a TRS not a TRS+ they have a different back plate and the TRS is heavier.
Thanks for pointing that out, I didn't notice
How are you dropping your chain is it your current guides fault or is it bouncing off at the top (I presume a 2X crank) the chain will always bounce off on the real rough stuff without a full on chainguide
From what I can tell, it seems to be jumping off from the bottom, although I may be wrong. I shall look more into it when i get time one evening. Other people I know at Uni have had the exact same issue with the Superstar one though, so I'm reasonably confident that the chain device is the issue.
My current one is one of these: http://superstar.tibolts.co.uk/product_info.php?cPath=56&products_id=336
They don't seem to be that well made, the roller seems (to me) to be too wide, which results in the chain walking sideways on it, and so it can easily pop off, after that it's only a matter of time before it comes off at the top.