It seems to me that in an F14 class, as long as you fit into the box rules, there is no handicap. The only exception would be the newer style dagger board boats vs. the older style like hobie 14.

I don't see how you could sail in a regatta as an F14 without others and be scored fairly. You would be better off (in the H14 case) by taking the hit for the oversized main and the addition of the headsail.

The F18s are all close enough (IMO) to have a Portsmouth rating, but I bet if the PR for their individual boat is better, they would race under that for an open regatta!