Just curious why you went with Cooper over the BFGs. And are those Coopers D or E rated for loads? I must say the AT3s look a lot beefier in your pictures, I was dead set on getting Goodyear Duratracs, but may look at the Cooper line too. As far as cupping, I'd recommend rotating them every oil change. How far off was your alignment? Also with larger tires how do you tie rods look, I would have hoped that the alignment shop would have pointed out some play if there was any.
Just read through your post, I can't believe the price you got for that top! I guess I'm going to hold out till something better comes along. My wife and I both really like the TC650, but there is a used TC800 local here (which is older and selling for more than yours).