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Tires was the issue . I replaced the KO2s with Nittos . Less than a half inch shorter ( BFG 34.5 to Nitto 34.09, an inch narrower and almost 20lbs lighter per tire. I think one of the biggest things was something I complained about all along the rotten no sidewall 20" wheel with a 10 ply tire on a truck that only requires 4 ply SL standard load tire which is what it came with from Ram.Have you tried a different set of tires ? you said you didn't have the vibes stock, or even after the Rancho quicklift, then added tires and boom, nothing you did didn't matter after that to stop the vibes.
Also, if you want to make sure the front DS is not the problem, take it off completely, but why would it be if you didn't have the vibes with the Rancho QL and the stock tires.. ?
Also from the Jeep world, how much PSI are you running in your tires, some JK's for example are vibe prone if the tires have too much air, i used to run my 35's at 30PSI, but i know people having to go down to 25psi to keep their Jeeps happy. I'm running my truck at 45PSI with 315/70/17, because that's what Discount tires set them too last week, but i'll be doing some chalk testing to see where my tires should be.
Ouch, glad you found the issue.
