It sounds like you might want to invest in a displacement edge board. they carve through the water rather than ride on top like surf style boards. And since you're not surfing, there's really no reason to get it. I'd say either go for a racing board if racing is your thing, but if you just want a stable board of a racing STYLE, the riviera VOYAGER is a sweet option. and it's really cheap (only $1100).
check out my review of it for more information. I've been on it multiple times and it's a really fun and fast board, but also really stable/
My review on my blog ^^^