Sway bar discos make a huge difference. I used to flex till I lifted a tire. After taking off the sway bar, I flex till the tire stuffs into the rock slider.
Brake lines should not be capable of limiting flex. If they're too short, they'll rip off. Making sure yours are long enough is a matter of safety, not flex.
Shocks can limit flex in both directions. If yours are not the right length they will run out of travel in either (or both) directions. Disconnect a shock at the bottom end and jack up the Jeep from the frame so the suspension will fully droop. Now extend the shock and see if it reaches. If not, it lacks extention. Now cycle the suspension compression by lifting the Jeep from under the tire until the suspension is fully compressed. Check the shock length again. Got enough compression? If it's lacking in either direction, it's limiting flex. And flex limited by shocks (rather than bumpstops, on compression) will destroy the shocks.
For leaf spring rigs like your CJ, Terra Flex makes revolver shackles and Z-boxes that improve flex drastically. You'll have to re-evaluate shock length with these in place. Also bear in mind that they have a mild impact on daily driving, since they tend to clang a little as they load and unload. Noisey sometimes, but harmless.
A CJ can gain flex by switching to YJ springs. Conversion kits cost a couple hundred bucks, and the ones I've seen do not include the springs.
For ultimate flex, of course, you'll have to change to coils, but that's probably a larger job than you're interested in.
\'98 Dodge Ram - 408 stroker motor, 7\" lift, 37\" Swamper SSR\'s, 4.56 gears, front ARB, rear Detroit, front ARB, ORT bumpers, Armorology rock sliders, MileMarker 12000lb winch, 700W Kenwood, KC, PIAA & Lightforce illumination, Realistic CB, Magellan GPS-315, Delorme GPS navigation, custom paint and bodywork by Rocks & Trees Inc.
\'89 Jeep Wrangler - 9\" Skyjacker lift, 383 stroker Chevy, Holley Projection TBI, TH350, NP203, D44 front with high steer, 12 bolt rear, Blue Torch Fab diff armor, 5.13 gears, Detroits, 37x14x16 Swamper IROKs on 16x10 with Staun internal beadlocks, Poison Spyder rollcage, Poison Spyder Stinger, MileMarker 12000lb winch with dash mounted controls, Steel Horse interior, 5-point harnesses, Cobra CB, Puma Onboard Air, Lowrance Baja-540C...
\'96 Jeep Cherokee - the Family Truckster...
\'82 Kawasaki KZ1100 Spectre - Stock
\'97 Chevy Camaro convertible - Stock, Sue\'s toy
\'95 Pontiac Trans Am convertible - NOT stock, \"Objects In Mirror Are Imports\"
\'03 Mitsubishi Lancer OZ Rally - Stock, the $4/gallon driver