powernut

hi all new member , im about to change/modify my currant turbo which is a to4b .84 t4 turbo which has run 18psi daily without a issuise , but i want more boost and slightly lower down spool, so i plan to use a holset hx35 t3/twinscroll 12cm houseing,76mm straight thow pipe,with a homemade twinscroll manifold ,
but first i have a holset 12blade /8blade hx35 ,which will run 20/25psi daily
is there any in spool/boost differnce by changeing the cold side to a 7blade hx40 with keeping the oringal 12blade 12cm turbine and exhaust houseing, as the hx35 to the hx40 has one blade less?and are angled differnert fins?