stiffer torsion bar = more "impulse" at the torsion bar anchor. Think of the good old palm tree scenario: Thin palm tree bends and rarely breaks, rigid tree will break at the trunk or pull the ground up around it if it HAS to bend. Same as a torsion bar (or an unwound spring, or even an axle that doesnt have a taper to it) if it is so thick as not to twist (or bend or give) ALL the torsional force will be directed to the anchor socket (none will be absorbed in the twist resistant heavy torsion bar) ONE of them is going to give, either the torsion bar in a "wind up" twist, or the socket spinning in the channel..not good unless your socket is beefed up. Those plates look like a very good idea, im going to hit them with my MIG next time Im under there myself.
