March is spotty for trolling offshore. Your best bet in Charleston is bottom fishing with Mark Brown. The bad news is that you can't keep grouper until May 1, but if you are looking to have a good time, he will put you on enough fish to make your back sore the next day. You can easily get 6 on his boat, and even more if you need to.
http://www.charlestonfishing.net/
843-881-9735
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