My experience on the California coast is that the boat handles swells well, perhaps even better then a deep-v; wind waves are the more significant issue.
In the 26', wind waves up to 2' are not a problem, can be smoothed out with trim tabs (by lowering the bow to cut into the waves), and we can maintain speed. 2½' - 3' wind waves are OK but choppy, and require dropping to displacement speed. 3½' - 4' waves get pretty rough. We drop speed to 2 or 3 knots. It can be done, but why? I mean we're doing this for fun; right? We will not deliberately head into 4'+ wind waves.
By contrast, I am comfortable, and can stay on plane, in large swells (i.e. 12'@17sec or 7’@10sec), just so long as they don't get too steep; remember that we don't have a keel.
When going against large swells you will find that you have to watch your speed at the crest more than a deep-v because if you overpower the crest, and land on the water, the low-rise hull slaps the water rather than cutting it.
The deep-v can cut through, and stay on plane in, more wind chop, but the low-rise design of the C-Dory gives greater lateral stability, and more predictable handling, at displacement speed, when the deep-v will tend to wobble back and forth.
Hope this helps a little. I'm sure it's not as good as a test drive. If you happen to be on the mainland, near San Francisco, go ahead and email me; my boat is usually in the water, not far away.
David
PS. Perhaps you might try emailing some of the Hawaiian C-Brats. They won't see a PM until the next time they log in, but email is forwarded to them right away. If someone is registered, but not active, you might have a long wait for a reply to a PM.