it flattens because the springs are junk. they sag after a year....i know from experiance. i put on a BDS lift after my rough country lift and added the BDS shocks as well...it rides so nice now and it went up 3 inches from a lift kit that was a year old. i honestly didnt think it sagged so much untill i measured before and after. it looks great after you do it but give it 6-8 months you will be rubbing when you flex. dont waste your time on a junk lift. my BDS lift has been in for 6 months now and still sits just as high. i got the springs for 86$ per axle from an offroad store here back home and it was like 20 for bushings and 15 for new Ubolts. the only thing i didnt get from it being a full kit was T-case drop and new pitman arm because i had those already....but you said it already you get what you pay for and rough country just aint worth it im my opinion. plus i got in a wreck with mine and the springs folded into a Z like shape...made for a good picture but no one has ever seen one like it.
95 wrangler 4banger 5.25 " of lift sittin on 33's black steel rims Gone But not Forgotten
Tow Vehicle: 2003 GMC 2500HD duramax 6.6, 4 inch turbo back magnaflow exhaust, tow mirrors, 285/75/16 BFG A/T's Westin brush guard and steps, leer cap, K&N intake, Sirius sat. radio
dont waste your money on junk lifts, save a few extra pennies and get something good.