I have very limited experience here, but will put in $0.01 anyway (hey, it's a forum). I just ran the RE-11As the first time this weekend and was very impressed. Excellent grip, great breakaway & communication. They also showed amazingly good wear after a day of abuse at the track. The 280 wear-rated S-04s got beat up worse. I was running 275/40-18 (no, those are not listed anywhere online. However, they are on my wheels, so they do exist).
Are you comparing the wear on the rear or in the front?
The reason I ask is that, if I'm not mistaken, you recently got camber plates, springs, and Koni dampers, and that will certainly change how much the outside edges get eaten up in the front. But in the rear, I'd expect it to be a much more appropriate comparison.
I'm due for a new set of tires, so the RE-11s are an option. However, I'm not actually interested in getting much more grip than I already have. I suspect that a grippier tire will make the suspension less happy, that the reason my car feels reasonably neutral, responsive, etc., is largely because the grip of the tires falls within the design parameters of the suspension. For that reason alone, I may stick with the S-04 Pole Position tires I've been using. It doesn't hurt that they're about $220 each versus about $310 each for the RE-11s, so the RE-11s would have to last about 50% longer than the S-04s in order to be equal in value.