Adjusting dual-pivot brakes
I'm trying to adjust the Ultegra dual pivot brakes I recently purchased. This being my first road bike, I'm only used to cantilever/v-brake type systems. On those, as you know, you adjust the toe-in. I can't seem to do that with the Ultegras. The front pads are pretty even, but on the rear one pad has significant toe-in and the other has none, almost toe-out by the appearance. When I try to adjust the toe-in, the pads revert to the old settings as I tighten them. I can easily lock the rear wheel while rolling along slowly (700x23 tires, not a lot of rubber). At slow to moderate speeds, I can put enough force into the front brake to lift the rear wheel off the ground. However, it bugs me that the rear pads are so out of adjustment compared to what I'm accustomed to seeing. Compared to V-brakes and disc brakes, I'm used to much more braking power up front. The brakes just don't feel as solid as those on my mountain bike.
I don't have any odd noises, squealing, etc. Is this just how road bike brakes work or am I missing something? How do you adjust toe-in if you don't have the little stack of cupped washers like those on v-brakes?