There are a few other things to try. Loosen the LCA pivot pin nut and loosen the pin in the k-member. This might take tension on the hexes.

You can also remove the pivot pin nut and the strut rod nut and bushing. Knock the LCA rearward with the torsion bar. Then hold the bar and knock the LCA off of it.

PB Blaster and other rust breakers can also help.

Lastly, if you are not going to reuse the bars, cut them in half.........