It’s unfortunate Toyo refused to help you on your OEM A36’s. Sometimes the rim may also contribute the vibration but that’s less likely, Over 20 lbs on road force balance certainly is not a good number, you can keep fighting and escalate the issue to the superior on both sides, MNAO and Toyo, but it’s going to take your time and effort. Depending on your mileage (you’ve never mentioned), you can just live with the vibration at 60 mph until you need a new tires; or you can get a new set of good V-rated name brand tires such as Continental CrossContact LX25, or Michelin Premier LTX from a good tire shop such as Discount Tire Store right now. If your CX-5 is still having the same vibration issue, they can help you to resolve the problem for free, and you can even return the new tires for refund and put back your old Toyo A36 tires (so make sure to keep them until you‘ve verified the new tires do eliminate the vibration). Doing this at least you can find where the culprit is and it’s not from tires but from rims or something else.