The roll center height is defined by the track bar frame mount. If there's not a track bar present, then look at the next links that are laterally locating the axle. If the uppers are doing all of the work in that regard, then that's where the roll center is located on that end. Obviously the more work the lowers are doing (more triangulation), the lower the roll center will be.
The roll axis is just a line that goes through the separate front and rear roll centers and is the axis about which the vehicle rolls. The flatter you have the axis (the closer to 0 in the calc), the less unwanted steering input you'll get through the suspension cycle, regardless of arm length. Play with the separation, mainly the lower link separation at the frame and you'll see the roll axis change. If you look at the screen shots I posted early on in this thread, I'm sitting at 0 roll axis so I'll get minimal steering input when cycling.
FYI, just because the roll axis isn't low and tilting forward doesn't mean that your rig won't drive well at high speeds through rough stuff. Personally, I'd rather have a higher roll center and flatter roll axis than anything else. Stability and predictability are what I value the most. In my suspension's previous setup, it felt great through the high speed whoops and I was consistently the fastest one of the group through them. It should be considerably better this time around and the roll center and roll axis haven't changed.
When it comes to sway bars, don't let them even enter the equation. All they're doing is working with what they're given.
And as for your anti-squat, you don't want to shoot for >100% if you can help it, which you can. I know what you're thinking--if the rear end doesn't squat, the front end won't rise. Wrong. Focus on one end at a time. The last thing you want is high AS in the rear suspension when climbing steep ledges/walls. Hopping due to the high AS will cause a lot more trouble than you think. Shoot for 60-80% and when you do the rear, focus on keeping the anti-dive in a similar range. If you feel like it unloads on you too much, go with a center limit strap. I bet it ends up being a non-issue for you, though.
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