UCA/LCA Question

[RSenese]

I have a 2019 JLUR, on a skyjacker 3.5-4 Dual rate long travel lift kit, on 37s, so it sits pretty high over factory.
Roads like A1A where I drive max 50 miles an hour there is no issue,
However highway is another story. At 70 I'm all over the place, and if an 18 wheeler comes by I have to brace myself to get ready to get blown to the side. At this point I avoid 95 because it makes me anxious, but that also makes a big difference as far as time driving goes.

It was recommend I added adjustable control arms to hep solve this problem.
I purchased and will have installed on Friday 19th
JL24LLX - Wrangler JL 4WD Single Flex Front and Rear Lower Link Set

But now im wondering, should I add the single flex upper control arms for the front and back too?
Its another $420 on top of the $527 for the lowers, which hurts, but if it will make a significant difference, I'll do it .
And I would prefer to have it all done at once then two trips to have uppers put on as well.

My question is, to solve that issue at high speeds, would the LCAs and UCAs combined make a bigger difference than just the LCAs?

Thanks for the help

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[spies]

If you just want to get your caster angle fixed, you really only needed front lowers or uppers. No need for both and no need for anything in the rear. But those are really good arms (johnny joints are great) and a full set of 8 will allow for a lot more articulation and you will be able to really fine tune your wheel base, caster, and pinion angles.