Dont confuse bouyancy with stability.
A boat has chine because the builder doesnt know how to create a curved surface OR the designer is trying to create a custom stability for a application OR the marketing departmet found that consumers like the straight line going down the length of the hull. Hard chine on non planing surface is a gimmick. Best use of chine is a powerboat v-hull. Its stepped for various speeds to stabalize the hull and provide a cutting edge for turning.
The 2x4 was a great test of bouyancy versus wetted surface. The 170 is almost a flat bottom boat. When it heels it displaces the same amount of water as when it is flat. It is less stable when heeled, at 80-90 degrees it is most unstable, then when turtled, most stable. At all times it displaces the same volume of water. The rigging is wetted surface obviously and mucks up the bouyancy since it filles with water.
Hard chine wont affect wetted surface. Hard chine should be there to vector water or to extend a flat surface. I go back to tanker ships. Google "Hoegh Osaka Solent". Ask yourself why tankers dont always operate this way. Its becauce heeling is bad, heeling drives the flat bottom hull deeper, heeling results in suboptimal performance of appendages, it doesnt reduce displaced water and doesnt decrease wetted surface. If it did any of those things better heeled, it would be implemented tomorrow.
Sailors seem to be horrible at fliud dynamics even on a laymen level. Most probably still think sails work due to bernullies principal. They arent used to fluid moving at high speeds and reley on word of mouth and racing tips and tradition versus studying real world examples. About the best they can come up with is pull rope a to tape mark x. Look at speed indicater, repeat with different tape markers until the absolute value of the difference between max speed obtained and current speed is within an acceptable amount.
Want to be better at sailing, study things that move fast like airplanes, hang gliders, Sail planes, F-14's. Things that make a profit, tanker ships, things that defend nations such as military hardware. That technology immediatly crosses over to sailing, but most sailers are about 70 years behind. They are hung up on "one designs" built 60 years ago and make purcase decision based on words like "shippy", "graceful lines", "traditional".