Well, assuming your springs are the right combination of firm enough for road use and soft enough for offroad use there's not a lot you can do simply. Sway bars off or disconnected?
Rubber bushings flex better than poly bushings but good luck finding some that will fit the Calmini, and maybe even OEM, parts. Not to mention they wear out faster.
The front, being short arm IFS, is limited naturally. Short of a Hagan style widening mod or longer arms, not a lot you can do with it simply.
In the rear make sure the 5 link isn't binding up. I've never flexed our GV out much so I can't say what's going on. Did you lower the Panhard bar when you put the lift on? That can affect flex, ride, and other things if the springs are longer, the arms are dropped/longer, but the panhard bar isn't touched. You can have springs with plenty of travel in them but arms that are too short or bind and never see the full potential of your springs.
The sad part is a locker in the rear would solve a lot of this by simply being able to keep going even with 2 tires hanging in the air...but we don't have that option.
