I think the initial tuning of about 8" of rake, usually done by hanging a weight on the main halyard, is a reference assuming the boat is sitting level in the water. At least a few of the C&C 30-1 I have looked at are stern heavy, some by a couple of inches. I suspect that will add some to the rake that would not be there if the boot strip and water surface were parallel.
Under sail with crew on board the boat may sit properly. Given that people have reported noticing a change in weather helm from even a modest adjustment of rake the error in initial tuning by having the stern 2" low might be significant. A couple of weeks ago while out for practice starts we flew a heavy wind #1 ( a flatter cut ) and full main. Winds were 18 - 22 kts, gusts to 30. It was the wrong amount of sail to have up but the helm was fine. Eased the vang a bit and left some twist in the main, kept the #1 flat. With the boat level I have about 6" of rake. Michael Brown Windburn C&C 30-1
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