Dave,
I would start the process with the sailmaker discussing the bend of the mast you have, plus you weight and sailing ability. The sailmaker will be able to tune the sail to the mast plus your weight. I wouldnt go adding carbon to the mast until you determine that its too soft for your weight and sail needs.

Start with a sail maker a good one will want to know your weight and the bend charactoristics of your mast.

PM me, I've got a good person for you to talk to.
Bill