Originally Posted by
Scottrik
Raising the front of the shock gives more weight transfer to the front on-power and tends to provide more on-power steering.
Raising BOTH ends of the shock the same amount only raises the center of gravity because you haven't altered the geometry, you've just pushed it further in the air. A vertical shift through addition of a constant in cartesian coordinate linear equation terms where the line is defined by the axis of your shock.
Raising both front and rear of the shock the same amount will move the shock further from the pivot point which gives the shock a softer feel due to the increase in leverage. That is really the only difference. The goemetry is the same and yes it will slightly increase the CG but not much.