I have Rough Country hydros and they are exactly like that (very stiff and hardly move when pushed on). I wish I would have gone with gas charged because I think the ride would be much improved.
1991 Renegade, 4" Rough Country Lift, 32" A/T's on 15x8 Canyons, Fr. Runk Bumper, Rear Warn Rock Crusher Bumper, Ramsey 6000# Winch, 4.10 YJ Axles, Blower Mtr. Upgrade, 150 AMP alternator, ZJ Rear Disc Brakes w/Corvette MC, CB w/Firestik, Half Hardoors, Warn Steering Box Guard, KC Highlights.