Howdy KingJohnC, I ran your insufficiently-dense neoprene problem by a buddy of mine who's a Materials Engineer and quite the DIY guy. He suggested getting some neoprene and making copies of what you're running now but 110%-size. Then boil them for 5-10m. This should increase the density and shrink them to the proper size. Plz know this is theoretical, and I have not tested it. Hope this helps.
All the best to you and your Family in the coming year.
All the best to you and your Family in the coming year.