I got fitted I as looking at the graphite shaft assume the  backspin would be higher. 

both regular flex 6i  and  club sped  70 mph +-  carry 152( roll out 157)   for  steel,   carry 154 ( roll out  161)  for graphite .  

The backspin on the steel was 5300 + 

the backspin graphite was 4700 .  

1. Is this normal variation between steel and graphite ?

I leaning towards the graphite for the little extra ball flight. 

2. will  increase it the shaft +.5 in and 2* upright have an affect on the spin?