Where did you get your 5 alignments done? Dude man stop fixing issues with parts you might think are working! because its only going to end up being really expensive.
common areas to check first. Bushes and the alignment. (post up your before and after read outs). Toe in will minimize tramlining and give better straight line stability.
Next was to check the pump. What kind is this electronic? or belt driven? if so check pulleys. next was check fluid levels and then check to perished hoses from rack to reservoir and pump.
Check the rack and the tie rods.
And check the springs and dampers. and also plug in a diagnostics.