Rough ride after installing a spacer lift and larger tires.

[Stickerhead]

37’ D load range on 2” spacer. 28 pounds. Nice and smooth. E load range is to much for a jeep. I would have got C if they made them

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[Uhdinator]

https://www.4wheelparts.com/a/tire-wheel-package-guide-tire-pressure-checker

Did you put on longer and better shocks.........you need a little better shock thats longer as well if you did not replace them. Running 30-32 in my 305/65's. Tire pressure only goes up about 3 psi when warmed up (10% or a little less).
If the tires pressure goes up more than 3-4 psi with 30 psi in them, you're likely a little low. Some tire guides say that MT tires vs factory all seasons will likely heat up a little more than 10% and thats normal.