rollers are to light i had this problem with my variator got better, when i put 14.5s in then better with 15.5s in a malossi variator but not good enough this is my opinion but get clarification from others as im nto to sure
yeh i had 15.5 in a malossi varo and the bike ripped straight to top end.. your rollers are to light mate. have a play with some heavier ones
see this is my point prove every1 says yeah 12.5 12.5 lol just because they think its right when it never usually is it depends on setup mannnn