Jambo, that was Raven tor descent we did.
This new line is kinda dull other than the features FR is freezing on.
I’ve only been down the once following Si and i can understand how arse twitching it could be if you look anywhere other than where you should be going. Try to stop looking at the lip of the roll in, and look further down the trail where the bike will go. The fact the front wheel is virtually on the lip whilst your lining yourself up won’t help as you making sure it doesn’t roll off before you’ve hoiked the rear around.
Next time only try it twice and not ten times, it’s too much pressure on yourself. imho.