When you say that power can come from either rake or softness have you ever tried or seen a C3 Jay?
The fin i have appears to have no rake compared to a deb fin, but it's hard to quantify as its a different shape. However the fin is soft with lots of twist.
Would you think that such a fin would be more powerful than a R13 H +2 in light wind?
Most deb fins now seem to be both soft and racked at least +6