Control Arm Bushings - How tight should these be?

[DieselSJ]

They should be threaded all the way to the arm. As others have said, most important part is making sure the shaft is centered exactly on the arm - if you don't, it is going to jack with your caster settings. I just did my R30 which is the same setup as this. I greased everything before it went back together - shafts, inside and outside of caps. Got it all snug then greased it as I cycled the arms up and down, then torqued the caps.

When tight, the arms will not fall under their own weight, but I could still easily cycle them by hand.