RE: need advice on a slalom board
You've raised an interesting question, particularly with regard to your specifications. I know the Gorge on some great days, and I'm similarly sized now, so I can appreciate what you might be asking here.
I think that it's important to decide on a bit of focus here, especially since some leverage can achieved from a production versus custom scheme. Where do you want to sail in the Gorge, especially with slalom in mind? I guess what I might be aluding to is a Dale Cook/Bruce Peterson approach, or something more mainstream in thought. No opinion one way or the other.