Compressing ('boning') the leather isn't to make it thinner. It helps bring the natural silicates in the leather to the surface. It's these silicates in the leather that actually are doing the polishing rather than the leather itself, but if you're going to be using this leather with a polishing compound the need to have the silicates present is lessened. Your goal of using this for a convex edge necessitates a softer surface, so having a thin leather top mounted over some sort of softer base (perhaps thin neoprene or thick cloth,) will give you the desired results. For a convex edge, personally I'd use Jantz's leather uncompressed with the rough side out! Or still better, a thick piece of suede! :thumbup:
Stitchawl