diy adjustable strut rods

I think that a solid mounted fixed length with no "give", as it sweeps an arc will push and pull the lower arm as it moves above or below its normal at rest point. so i'd guess your comment is correct.

The rubber mounted strut would have some GIVE at the K member end and will still sweep an arc as the supension moves but the push and pull will be less because the K member mount allows some movement fore and aft. The impact on the lower bush would be dependent on how hard or soft the strut rod mounting was. As standard i assume some calculated effort was mode to provide a compromise.

solid mount and i think you will need less toe in.
gains in free movement and therfore better handling
loss in longevity of lower bush
potentially more changes in gemoerty as suspension travels that may or may not be of benefit dependent on roll tyres etc, i wouldn't want more bump steer for example .
greater potential to pull strut rod mount out of K frame and wrap lower arm back in a collision or clipping a curb stone at speed.
run higher spring rate and appropriate shocks and you probably limit impact becasue suspension travel will be reduced.

guess it comes down to intended use.

Dave