Tom, I don't know if there's anyone in your part of Maine. There are a lot of instrument and bow makers in Maine, though. Perhaps George Rubino could give you a referral. He's an excellent bowmaker (and bassist) in Pownal, near Freeport.
http://www.rubinobows.com Or, you could go to several guys down in Boston. As you are a carpenter, you could try it yourself with some advice and encouragement. Here's the first step: Break out your adjustable-mouth standard-angle block plane, and sharpen the blade at about 30degrees until it's as sharp as possible. Then check back here.
Oh, by the way, one of the most common causes of excessive camber (scoop) is the fingerboard coming loose from the neck, usually at the nut end. You'll have to check it out with the strings off, so watch the soundpost...
