Tom
The problem you have is returning tyres and claiming they are faulty is big business,when I returned a mates RoadSmart and was informed there was nothing wrong with it and if it wasn't collected asap it was going in the skip but their are so many chancers trying their arm on the basis they might get lucky and get a freebie it's frustrating.
I went in person here in the UK they normally have vans out on the road collecting returns I actually saw racks and racks of them,the quote I had 'after the tyre is cooked it's impossible to tell if it's flawed!!!',it goes down hill from there the criteria for getting a credit is pure pot luck.
The RS I took back hadn't done 800 miles and they were saying no I saw a rear that was bald and the owner got 100% there's absolutely no science to it what so ever,so if your prepared to gamble on the cost of postage give it ago send them back with a covering letter,just bare in mind that TL's profit on that pairs of Michs is peanuts and so customer service is on par with such but hey you never know