well on my s2 I have BM quick shift installed

an when im in the 2 gear an want to switch to the 3 gear is difficult and scratch an high rpm
at low rpm no problem the 3 gear goes good in

also from the 4 to 3 gear no problem
it always scratch fom the 2 gear to the 3 gear when trying to put the 3 gear in

and also on the motorway at the 5 gear at low rpm sometimes the gear jump out

strange? thanks