The Quick adjust has been explained pretty well.
What is the adjustment block on the rear springs set at. There are 3 settings.
If its on the stiffest you'll have to go to bigger springs. If you go that way look at 75 degree instead of the 90's.
A Motto to Live By:
Life is not a journey to the grave with the intention of arriving safely in a pretty, well preserved body,BUT rather to skid in broadside, thoroughly used up, totally worn-out and loudly proclaiming
WOW , WHAT A RIDE !