Hooray! Problem resolved. Tires were not 'round'. (Egg-shaped). Third time a charm at Discount Tire. First time (after buying the tires) I got the tires balanced and then reported the issue to this log. Second time, they "road-forced" the tires. This was done using a Coates machine (they do not have a Hunter as one of the responders of this issue suggested). The tires were OK but off by a 1/4 ounce on the balancing machine. Problem still persisted, maybe just a wee bit less. Third time, today, I suggested moving the rear tires to the front and vice versa, as per another responder's suggestion in this blog. Instead, they checked all tires of which two were found to not be 'round'. These two tires were replaced. Now, they can't tell me which two tires, which doesn't help things out. But they said that all four were now round. (I think they probably know after all.)

However, the manager said that he only replaced the tires since I had been in a couple of times. So from that, I infer that they probably install these non-round tires on cars anyways. They probably don't check in the first place. I did call back and let them know that everything was OK. I may write to Discount since the manager didn't apologize at all. Instead I had to milk the info out of him. He was probably perturbed at me.

Thanks to all for the suggestions. I printed out your ideas and showed them during my first two visits to Discount Tire

Regards, Rivdog
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It's worth fixin'