The stock OEM shocks were designed and tuned to work with the factory springs, at factory preload. When you increase tension by creating preload, or putting in a lift spring, you decrease down travel and increase the spring rate. The shocks are not designed to provide the down travel or damping necessary to adequately dampen the increased force of collars or springs. You will unequivocally decrease drivability and handling as all these sorts of lifts are for cosmetic purposed, NOT to increase the trucks performance. If you want to increase performance, you need to wait for a set of bolt in coilovers from Fox, King or Icon. You can also go all out and send it to custom fab shop to do new coil buckets and longer arms, tie rods, axels, bump stops and limiting straps to get crazy more travel.
This is why I am going with the Eibach 1" springs as they are very mild lift, and the negative affects of lifting will be subtle and I can have a solution that subtly lifts me while still maintaining some positive aspects of pleasurable drivability.