Slave cylinder

hey i just put a clutchmasters stage 3 in and can't really get it over 2000 rpm. been working it out with some guys here that i know and we think i might need a shorter slave cylinder rod. think the stock ones just don't cut it. anyone else had this problem? if so let me know. when i find out the part that fixes it i'll post it so just incase anyone else has the prob they'll know