Angle of attack has a lot to do with loft as well. I use a 9.5 set to square with a low launch low spin shaft to help me keep it down. Some heads I can't use at all (the Covert is a shining example of sky balls set at 8.5) because no matter where I put the ball I hit down on it with the driver. I get good carry and good roll with my current setup though so I just accept that this is how I swing it and go. Other shafts I hit the ball so high with so much backspin it won't carry more than 210 and 0 roll. I'm not a super high swinger, 100-105 depending on how I feel that day, I can swing harder but I can't control it.
 
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