Tie rod exchange

Your best best would be to buy a set of solid tie rod adjusting sleeves. Most of the flex in the original split tube adjusting sleeve design in in the split tubes. Now, if you want it to look stock at a glance going to the 11/16" tie rods and adjusting sleeves will improve things.

But, even going to a set of 9/16" solid sleeves will get rid of the flex. The weak point isn't the tie rod ends, it's the sleeves. Not that you couldn't go to 11/16" solid sleeves if you really wanted to go big. I run 9/16" on most of my cars though with solid sleeves, and I run 275/35/18's on the front of my car.

9/16" Solid Steel Adjustable Tie Rod Sleeve

11/16" Solid Steel Adjustable Tie Rod Sleeve

They make them in aluminum as well if you're worried about weight, they're $59 instead of $49.