I am not getting another GP to improve my stroke, though it certainly could improve. I just want another Novorca, with slightly different (less) length or width, not both. I will definitely keep the 24 inch loom length. This will provide a slightly different gear ratio, which may be slightly better, or not, for my particular body. My boats are 21 and 22 inches in width so this is not at all a factor. Also, I am only interested in optimizing forward stroke efficiency. No surfing, except mild ocean following seas, and no heavy loaded boat.
The current GP is already a very narrow blade so I don't think the difference in head winds will be great.
Again, this is a minor issue for me, that I just find interesting to think about.