I have a 4" lift and using castor correction bushes. I don't have any problems.I do have castor correction bushing in my stock LJ78 arms right now. I don't like them because they are offset and stiff, so resist axle flex compared to normal bushings. If you look at the pictures in this thread, the 80 radius arm has more caster correction, but the problem is it's 12mm too short and doesn't clear the LJ78 steering components properly. It's not a good option. I think the best options are caster correction plates or a custom radius arm.
Where would you fit castor correction plates? You mean these I take it, Caster Plate Kit to suit Landcruiser 105 Series
See these, Superior Hyperflex Radius Arms Suitable For Toyota Landcruiser 76/78/79 Series Pre 07-2016 | Superior Engineering