dead rise

The amount of deadrise on any of the monohull C Dories is almost insgnificant. Some of the boats have a reverse deadrise at the chine, some have some arc to the bottom, but non really have significant deadrise as far as making a difference in the ride. The difference between zero degrees and four degrees would not be noticable.
 
I would think, though, that this amount of deadrise (and the reverse chines) would improve straight line tracking and turning performance.
 
In theory, yes.

In general, as the Hull V increases, it takes more horsepower to get the boat on plane. It also requires more speed to remain on plane.

The flattest surface is the easiest to plane (like bald tires on your car!). The reason to add a V shape to the hull is to make the ride more comfortable. Imagine a boat with a box shape. Would plane easily, with little horsepower, but would feel every little wave it hits.

This is why the 23 Venture has a slightly beter ride than the 22 Cruiser- it has a sharper entry forward to give a better ride in a chop, but takes a bit more power to run the same speed.

A similar sized Bayliner Trophy has a deep V that is most comfortable in a chop, but that hull shap doesn't like to run between say 12 and 17 knots. Below that it runs okay (although will wander side to side and not track straight due to the Deep V hull wander phenonoma) and above that it runs fine, but in that intermediate speed the boat will wallow and generate a huge wake.
 
To add to Matt's excellent list of effects of increasing dead rise, a boat with high deadrise (deep V) will roll more in beam seas, at low speeds, such as drifting or trolling. It may also be more difficult to control in heavy following seas.
 
And to add to Bob's comments, at anchor the C-Dory's are noticeably more comfortable if waves roll in a bit. I've owned numerous deep-V's, not too pleasant some nights at anchor.
 
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