i just installed a PC 6" lift on my 05. the front sits a tad higher than the rear as i have the Pro 4 x Coilovers in the front. i have the 3" rear blocks that came with the PC kit. i put Bilestine 5125's 2-4" as well. i have my 1.5inch rear blocks from my mini lift left over can i stack them on the 3"pc block? ill have enough u-bolt to bo so but is it safe? will it work with the shocks?