If you used actual 2" spacers front and rear, that is the reason the front is higher...
A 2" spacer in the rear, raised the vehicle 2" in the rear, but a 2" spacer in front raises it more than 2", due to the geometry of the front control arms, in other words the spacers sit inboard and the lift is multiplied since the wheel sits out at the end of the control arm.
Jack up the rear and see if the rear a-arm pivots down at all, if it does, (and it will) then it isn't binding just sitting on the driveway, where it will bind is under flex... where you have reduced the down travel.
Also, the rear shocks will probably limit your down travel before the arm arm will.
I never had any binding with a simple 2" longer coil in rear, but now that I have added additional spacers, there is some binding, AND my extra long shocks are even limiting down travel.