One quick suggestion... When I first was digging with my trusted tire and allignment folks my 2015 issues (before the flat spot correction came out), the Hankooks were ok as far as a natural balance (when not flat spotted after sitting still). However, disturbing issues were found on the wheels. Especially the rear wheels. They had to go through all kinds of gyrations to get a true Road Force balance.. When I will get the new tires, I will ask for two replacement wheels. They are NOT bent.. Some weird and unseen out of balance issue.. For now, thanks to their hard work, all but one
wheel are inside the Road Force Certification window.
Point is..... Check the wheels..... Check with certified Road Force engineer, with a recently calibrated machine. May not be the tires if Hyundai
wheel maker has some casting problems (I do not think they are forged wheels like the 20"s on the F350 King Ranch). Factory balance may not have shown issues, that now shows up from a retail balance machine not knowing how to handle this.
Or, Continental has some moisture issues inside the foam used to ad sound suppression inside the tire. Or some other systemic out of balance issue related to the foam sound insulation.
Hope this helps. This process is good in any case.. Do it right, and the tires will, be balance liked you have never seen.
Also, I have found over the years that low profile tires, will need to be in a ultra fine setting for any regular balance machine. If the dealer did not set this, could be off as much as .5-.75oz.. .10oz off has been felt by me in certain situations.. If they balanced to .25oz and above as the allowance for showing balanced tires, you will feel that.