Join Date: Sep 2007
Location: Pasadena Md - Magothy side
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20 degrees should not lift the intake out of the water IIRC. I don't own a C30 but spend a LOT of time sailing one with a friend (yes sailnet regulars, I do sail on monohulls once a week or so).
Closing the seacock might be the answer if that is the problem, but frankly I'd look at the impeller and possibly at doing a flush of your fresh water system. You might have a clog in your system, or since it's a C30 age unknown it might just be time to get all that gunk out (gunked up tubes can put too much back pressure on the system). Next look at exhaust system flow. Always look at simple fixes first - the boat was designed to sail at 20 degrees after all.