Take your Jeep and loosen up the bolts for the springs and the shackles. With all the weight on the wheels either jump on the bumpers or drive it over a few curbs to settle the suspension. retorque to 45 ft/lbs.
Jump on each bumper and have someone see if the shackles are moving when you jump down.
I mean your current setup may not be cycling the suspension. I know I have a 4" RC lift. My final solution was to ditch the stock shackles and put on some 1" boomerang shackles. Lightly torqued nylock nuts and she cycles fine. Throw away the cheap shocks that came with the lift and buy some billsteins (5100s) or some fox shocks.
That will bring the ride quality back. Yes RC is a little stiffer and may sag faster as everyone says. I have made mine just as comfortable as coils with a little work and few more $$$. It cycle well and I can stuff a wheel no problem good flex and no issues.
Try it and save the coil money for a winch that is a big mod.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184