had same issue when I got my xt and severne sails, went to aeron extension to resolve the issue.
I found myself adding a little extra extension (2 pin holes) and then when downhaul applied it left about 2cm which was enough to twist and tuck the lever away.
Now when I use the aeron extension I take a downhaul bar to the water edge. (ie rectangular wooden block 2 inches wide, inch thick, 8 inches long with 2 holes drilled in the middle - loop and lock the rope and get your back into it). takes 3 minutes longer and you can't adjust the sail when out the back in the water but hey small price to pay.....
but for what its worth check this thread
www.seabreeze.com.au/forums/topic.asp?TOPIC_ID=47011also try the search function and you may come up with more results on the severne and xt compatability
