I use the adjustable rod basically to deal with tolerances. Poly LCA bushings don't hold the LCA in position. Poly strut rod bushings may install thicker vs rubber. I run poly in both locations. Plus there are tolerances on the K itself.

On the drivers side, I had ~1/8" play/gap at the LCA bushing with the OE strut rod. I couldn't get the alignment dialed in and it moved in use... not nice. The adjustable rods got the slop out. It took some fiddling to get it right and not bind up the LCA.

Cranking on the strut rods to gain caster beyond getting the slop out is likely to bind it up and shorten bushing life. Better to use the offset UCA bushings and/or aftermarket UCA's to get caster and camber set for handling and the adjustable rod to get everything positioned correctly