I'll be installing a pair of 08 Pro X front springs, on my 05 XE 2wd. Ill be using my currently installed 5100s. My question is, should I leave the 5100s adjusted to 0 perch or no increase in lift. I want to even the front of the truck with the rear of truck height. The new 08 pro4x springs will have a couple of inch lift, I'm shure. So if I adjust the 5100s higher, it may sit higher than the rear? Thanks for any feedback!