I double-checked with Global West and the primary purpose of the off-set shaft is [as Goose mentioned] for restoring 0 degs of camber, (as a frame ages they tend to sag in toward the engine creating negative camber). And, 2nd the ability to dial-in more caster with less shims, [which reduces bump-steer]. Another use for the shaft is it can be flipped 180 which provides 1.25 degs of negative camber for road racing. This may be too aggressive for the street, but if you're not concerned about tire wear, this may be an option.
I'd like to maintain the stock appearance with updated geometry. As Goose mentioned, the Guildstrand mod is permanent which doesn't appeal to me.
