Replaced failed strutrod poly-bushing today - Took video of working suspension

How many miles on the failed bushings?

I think you know that your custom bushings aren't a long term solution. The flexing you see with suspension travel is necessary with the solid strut rod, the LCA end has to move in an arc. The fore/aft movement with braking seems excessive, but really there is a decent amount of flex in the stock rubber bushings.

I think the big deal is why the other poly bushings failed. LCA pins are tight and torqued properly? What LCA bushings are in there? Was there any binding in the range of motion of the LCA with that strut rod length? How compressed were the original poly bushings with the strut rod nut tightened?

This is why I use adjustable strut rods. No guessing if the strut rod is the right length or if there's any binding in the LCA's range of motion, set it so there's no binding and it's taken care of. The adjustable strut rods are solid mounted, so, no fore/aft movement of the LCA because of strut rod bushing compression, just articulation.