5 inch springs will be just fine. I have all pro 6inch springs on mine and didn't modify the pack at all. I have no problems and I still had to trim the hell out of my rig to fit 37s. I would run them. I have heard great things from people about sky's springs. Even call down and talk to CJ at marlins he'll tell you the same thing. And yes removing leafs from a pack can cause pre-mature wear they are built to a certain tolerance and rate. They don't put in there tech info......''before install remove leafs until desired ride height and quality''. I would run em.