I cant think of many reasons why you'd have such a rough ride, especially since it's a basic lift kit, which is why I'm suspect of the shocks first. The rear is deceiving with how much it really contributes to ride quality. I hope it's as simple as that, not exactly cheap, but not a huge undertaking to fix. I'll do some digging myself as its been a bit since I really nerded out on ram stuff.
If you have a set or can find a cheap set of spacers it's an easy enough swap to try. Time consuming but easy enough. Run the 6112s to one notch below the max height for your setup, I noticed that with my spacer and 6112 combo it sat a little higher than it should have by about 1/2" which isn't alot, but it's safer to be a touch low in the front vs way high.
The CVs/intermediates are about the same as the 2011, except out drivers side is the replaceable intermediate shaft now not the passenger side. I can easily get you part numbers as well, I literally have all the boxes sitting in my back room from partsgeek. I think both CVs and the shaft would be like $200. But again, no reason to fix something that ain't broke, but seeing as they're not sealed from weather, and OEM didn't grease the splines or anything, it's worth at least taking apart before winter. I also have a thread on the repair if it is bad on the passenger side, it's easy as well. Again, just thinking ahead since you see winter weather which does us no favors.
As for the rack, it's interesting and I have heard of these electric racks doing weird stuff. I would have to assume it would be something steering related you would feel vs ride quality, but stranger things have happened and I wouldn't rule it out as crazy. We're on the right track, just need to pinpoint each issue.
With the amount of preload you're running up front, those 6112s should be very smooth, and since you have a single cab I can't see you blowing through the shock ******. After messing with the spacers and realizing it's all a geometry thing in relation where the shock sits in its ****** vs where the suspension sits etc I gladly decided spacers weren't for me. It's 2021 we need to stop with the 80s idealogoly. Spacers and blocks have their place and it's not on IFS stuff. I've tried things, and they simply just don't perform as intended. What you're experiencing is exactly this and it's no fault of yours, millions are sold a year, but now we have to fix it. I say this cuz if you didn't have additional preload into the 6112s you would almost be sitting on the bump stops at ride height, it's weird and makes no sense considering the math on the 6112s is the same as stock, but the combo is causing something weird. Why now is anyone's guess. Did I mention I have quite the disdain for spacers and the companies that use them will blame the end user all day long.......rant over! You'll be sorted in short order, that I can say with confidence.