Bolter from Storm has used ramping for a while now and can still hit a constant 17+ bps in semi. He is a machine.
another tip is to not try to hard, if you think about it too much then you'll f*ck it up. just practice tapping stuff around the office / college and have your gun set up at home so you can practice holding it and walking the trigger.
if it's easier you can get an aftermarket trigger, I had a swooping trigger on my timmy so you pull more down then back and it helped a lot. You can get these for most guns (if not all) there is a company doing them for the mini's that I know of.
Dan,