Do the mod one by one bro. Test and really feel if that one mod is useful for you or if it is placebo. Step by step also allows you to stop once you are satisfied.
I would say let the pro do the stiff ring installation. It can take a good 30 minutes with de-bolt, greasing and tighten with the correct torque. I would not recommend DIY.
I would assume that you have front tower bar too besides that ARB. Feel the rigidity first of the whole drive after the stiff ring. Drive around more to decide. If you feel it is enough, stop. I thought I had enough only to find that my hands got itchy 2 months later. So I add on the rear lower arm bar (RLAB) to try try see see. I am happy with the result.
ARB and RALB is installed at a different position and doing different work. Not sure if you have looked under the car. If you are looking at the spring as a straight vertical line, the absorber is diagonal. They are not on the same line like the front.
ARB is installed at the bottom of the spring mounting. The ARB pull the 2 sides of mounting together. The springs now works up and down simultaneously in ideal condition. Therefore you will feel the stiffness on uneven road. By establishing these 2 mountings' dependency, the body roll effect is reduced by one side of the tyre being pulled to the ground by the other during cornering. Fortunately and unfortunately, ideal condition does not exist and ARB actually flexes. That is why you won't feel like sitting in a Triton, but still gives you the reduction in body roll effect. I must admit that the drive is slight stiffer than stock on uneven roads. With this flex also, ARB can only claim to reduce but not eliminating the body roll effect.
RLAB is installed slight in front of the ARB. The diagonal suspension lower end will go to a sub frame, which goes to a metal linkage which goes to the main frame. So the linkage will be taken off, leaving 2 holes at one side. 4 holes on both left and right, hence the 4 points bar. This bar is actually a replacement to the metal linkages. Eventhough the linkage is solid, heavy, but the bar is stronger, hence less flex, which in turn generates a better absorber direction behaviour. Pulling the main frame and sub frame together also strengthens the whole chasis. No more feeling like falling apart.
Where do you plan to go to do the stiff ring?
Very good and details info, thanks for sharing.