Okay, so i got into this after dinner tonight.
Pulled the fire box out and put it on a couple flat surfaces and no rocking. Looks like the problem is the interior of the actual Kamado. So, i've taken pictures of the fire box on flat surfaces & also pic's of the interior of the Kamado with nothing it in. I also took some video of it assembled with the box rocking back and forth and all has been sent to KJ. Guess we'll see what they have to say tomorrow.
Kamado Joe Classic, 18.5" WSM w/ CyberQ WiFi, 22.5" OTG, Weber SJS