OK skin boat gurus, here's something for you to chew on...

Last weekend, I discovered that my boat is a real handful in confused chop and it seems that a lack of secondary stability is the culprit. It's really tiring just keeping the boat under me. Two days later, I paddled my Nordkapp for the first time since I built the skin boat and the difference is night and day. It is MUCH more comfortable and relaxing to paddle in rough conditions.

I want my next skin boat to be somewhat different in shape (more like the Nordkapp) in order to increase secondary stability. For starters, I'm going to add a foot in length (to 18' 6"). In looking through the various books I have, I've noticed that many boats built by Greenlanders have little or no pinch in the ends. While I like the swoopy looking, reverse-curved gunwales from pinched ends, it seems that this really reduces the flare of the hull and volume at the bow and stern. I'm surmising that this negatively impacts stability and makes the boat a very wet ride. Does this make sense?

An addtional benefit to a less pinched shape is that it increases the width at the foot brace, providing more foot room.

I'm also considering moving the chine stringers in toward the keel more. I've read that this will decrease primary stability, but increase secondary stability due to more flare in the hull shape. However, I wonder if it actually makes the secondary stability higher or does it merely change the ratio of primary-secondary stability?

Thoughts? Ideas? Wild-ass guesses?