Right i was riding very hard yesterday non stop and my rear braking finger was sore but i carried on riding with it how it was, I use a v set-up now and i don't know if it's got anything to do with the lever, when i use to run a mgaura it never happened but all a sudden it's got really bad. I'm using a XTR lever by the way, and i hold the lever right at the end for better leverage. So anyway yeah my finger is killing right at the minute from yesterday and i don't think i'm going to be able to ride for a few days until it fully heels up. I don't know if it's the lever though as i've never had this sort of problem, Well not this bad anyway.