Ok my analysis on these setups. Firstly I still think that they are bit too soft and have too much bodyroll. Reason for opinion is that IMO the cars in LFS are sporty cars not comfortable cruisers. So if you want make setups like they would be if these cars were real here's what I think:
UF 1000: This car is close to old Mini and those cars dont' have soft suspensions and they have quite stiff ride (someone who knows more about Minis correct me if I'm wrong).
XF GTi: This car is a hot hatch not a moms shopping cart. Nowdays hot hatches don't have much bodyroll.
XR GT: Beside the looks this should be kinda sporty car also.
XR GT Turbo: This set isn't too bad. Maybe bit more ARBs and stiffer dampers.
RB4 GT: Diff locks all the way. Maybe open front diff like Lancer Evo used to have (is allready like that). Center visco is ok but more locking for rear. Imprezas and Evos aren't that soft.
FXO Turbo: I think this car would have some kind of locking diff and stiffer suspension.
LX4: A bit too soft and LSD wouldn't be a bad idea.
LX6: A bit too soft and need more locking on diff.
RA: Hmm maybe better that I won't say anything about this
FZ50: This is supposed to be 911 GT3 which is stiff and has more locking in diff. This car can't be made to drive as good as the modern 911s because of the unfinished physics. (same goes for RA aswell and some other cars).