the 75% mast is NOT like bicycle wheels
it is the recommended mast and should work fine
the investment has been made
buy a 100% mast and then try and sell the 75 % ? lose some $$$
in this sport - not every-one has the chance to try stuff - otherwise try the 100% !!!
if the mast is okay - why change it up ??
to show off those perrillis and handle some gusts better ??
are you saying over a certain sail size - one should only use 100 % ???