Patric,
I would sugest you involve your sailmaker from the very begining. You can go either of two ways 1) you specify the deflected mast shape and he/she optimizes a sail to fit or, 2) he provides you a recommended deflected mast curve and you design the mast to comply with the curve. Either way once you have established the deflected shape you are after, it can be obtained by either tapering the section, tailoring the layup, or a combination of both. Because of the directional properties of carbon it is possible to build a non-taperd mast to deflect to any curve you choose by selectively positioning plys of fiber. There is a lot of software out there that will calculate lamiate properties based on the orientation of the individual layers of carbon uni fibers. This allows you to try a lot of different concepts before investing time in the real thing. I do the calculations by hand but it's tedious! god luck,

Kevin