Squeegee,
I'm going to apologize in advance for refuting nearly everything you just typed. We're brothers in the Cruiser bond, so please understand it's my desire for accurate information, not a desire to put you down. All of what you just wrote is hogwash, and exactly the kind of incorrect "internet lore" suspension information that makes me crazy. My replies inside of these parentheses "{ }"
Here’s my experience with dealing with body roll. For starters, caster correction is your friend for every circumstance. For reference I’m running about 5 degrees of caster. Once you handle that, you can really tackle the rest of the issues you might have with 3 things: {caster has absolutely zero to do with body roll. You could set caster at 0 degrees, 5 degrees, or 30 degrees and it will not affect body roll}
1. Sway bars: these work great for controlling the body. What they do is in the name, rad. Bigger = less sway but it can attribute to a worse ride over chop and chatter since it will inhibit the axle from moving. I have a 7/8” antirock in the front and the stock bar in the rear for reference. Some people like whiteline bars, for my application, I didn’t think it would be the right move. {Sway bars were literally developed as a clever way NOT to inhibit the axle from moving, as the entire bar simply swivels without being twisted when the axle goes straight up and down such as chatter/dirt road ripples. It's only when either the vehicle is leaning or cornering that the vehicle must twist the sway bar, which has the desired effect of preventing lean/sway and leveling the vehicle out. Your 80 came from the factory with sway bars matched such that in emergency maneuvering, it would not severely understeer, or oversteer. Your choice of two different sway bars means that is now an unknown and your Cruiser may be dangerous in an emergency. From my knowledge, if your front bar is stiffer than stock(7/8 sounds thicker), in an emergency the rears will break loose first, causing dangerous oversteer.}
2. Low speed compression. Low speed compression can help control the suspension around corners, on soft g outs, … ya know slow stuff. Slowing the axle down as it comes up into the wheel well will the result in the body staying flatter around corners. The issue is, that the more you slow it down the more it’s going to rattle your teeth out over most things. I have Fox DSCs in the front and dobinsons MRAs in the rear and I just twisted the knobs until I found a happy medium. There’s some sway, but it also rides nice enough over chop, bumps in the road, random stuff like that

{All suspensions have low speed compression. In tandem with the other type of damping - rebounding - there is an extremely exacting balance. Too much compression and you don't use all of your travel. Too much rebound and the suspension "stacks" up and cannot recover between bumps, causing easy bottoming. Since you are doing precisely what good suspension design would NEVER do (Brand A on the front, Brand B on the rears), you likely have a suspension that is very far from optimal. You, as an individual with no testing facility or training in suspension design may insist "it's great", but the reality is there is way more potential in your vehicle than what you've done.}
3. suspension geometry. The rear panhard is the easiest to fix so start there. A $100 pack from eimkeith is what I used and I’m happy with the results. You can do high steer and move the axle end of panhard up. (big pain in the ass, do this if nothing else works). Lastly, if you still hate it, you can design your own suspension so if you don’t like it you can only blame yourself {The rear panhard has absolutely nothing to do with body roll. However, since you brought it up, simply moving one end of the panhard up randomly, will guarantee your rear suspension does weird things. The purpose of a panhard is to try to control lateral movement of the axle, and it's ends are located precisely to minimize that during suspension cycles. Randomly moving one end from the factory orientation will absolutely cause the axle to move left or right at or near the upper or lower limits of its travel, rather than seek to minimize it.}
Oh yeah, adding stiffer springs is not the move. If it’s the ride height you want. Keep it. Tall stiff springs usually mean a bad ride, tall ride height, and little uptravel. Short stiff springs usually mean a bad ride, good right height, and little uptravel {Pure internet lore. You can have a spring of varying lengths do the same job. Again - that is part of suspension design at the factory. Design and build specific springs that function correctly. Springs also have a great deal to do with sway, ride quality, and how well the vehicle can use (or not use) its available designed in travel. They must match the suspension geometry, the vehicles weight ranges, its wheel base, its center of gravity, its shock damping, and about 100 other variables that if ignored or not engineered together will result in a poor handling, swaying, bouncing inefficient suspension system.}
Again - not trying to be an @ss here, but your post was center of mass as an example of the state of people's dangerous home suspension ideas. If we were sitting around a campfire without the limits of a keyboard, that would have sounded less uppity, less harsh, more informative, and like a mutual discussion, and I'd have preferred that greatly.