IBO ratings are 30" draw w/ 350 grain arrow.standard.now if i had a 30" draw w/ a 375 grain arrow i'd be slower in arrow speed naturally............but alot more comes into play here.......like whats on your string.nocks?.....silencers?...loops? all that will decrease your arrow speed.
i ahppen to shoot a 2003 bowtech mighty mite....28" draw 80% let off not to sure od actually arrow weight but around 370. i have nothing on my string bu a loop and 2 leaches( i use the hind sight) and i chrony at 285......if i switch to the 65% let off module i shoot 295...not bad for a short draw. but i find it better for my shoulder and acuracy w/ the 80%.
lets not forget arrow spine...the arrows i shoot for 70#'s are to stiff for a 60# bow.it's all respective.but if you keep the same arrows(hopefully properly spined)and crank up your bow to max.it will be faster....in theory.like i said there are other variables

otto

otto