Wheels-Tires Wheel gap

Your options are shorter springs (with the associated increase in firmness and less ground clearance); remove the rear spring isolation rings (a little more drop, less ground clearance...noisy); or, go to a taller tire on the same rim (use a tire calculator to check the effect on your final drive ratio and speedometer, check the crossection width to make sure you have the clearance in the wheel well and in the vicinity of the quad shocks). Alternatively, if the car rides and handles the way you want, leave it be, get used to it, and park it next to a stick height Mustang or 4wd...it'll look in the weeds.