Same boat and I hate that. I never get twice the wear out of the front, it's always around 1.5. I will most likely try the s23s, but I'm also considering Dunlop Sportmax Q5S on the front, and a Dunlop Roadsmart 4 on the rear. It wouldn't be the instant matched set of the 23s, but I'm thinking something like 33 PSI cold in the rear and 36 PSI in the front may well even out the grip difference (I would carefully tune the PSI), and finally they would wear equally.