Blocks? The only way blocks will lower it is if you flipped the springs in the rear which lowers it about 6"...and it doesn't look like your've done that. Cut the front springs, we did on my friends truck.
We flipped the springs under the axle in the rear and cut about 3 coils off his springs. The front is riddin on bumpstops lol (he wanted it that low...??) and the rear is about 1" away from the bump stops. BTW those are 18's with 255 55's.