Re: series drogue or para anchor?
True canoe stern hulls are an older idea but there are still plenty of them around. They used to be and still are the choice of many long distance sailors regardless of what a few "name brand" sailors may use. They have advantages and disadvantages. Actually, the boats in your pictures are very close to being double-ended as are boats with overhangs. The main advantage is to allow a following sea to slip by in the same manner the bow lets water slip by with minimum alteration in direction. The stern buoyancy theory is probably true to a point but once breaking waves get high enough to hit all that glass, the stern will get pushed around more than in a boat with less exposed surface area. That doesn't seem like rocket science.
Alberg 35: With a philosophical flourish Cato throws himself upon his sword; I quietly take to the ship.