That is a beautiful piece.
My guess it could be a number of things that cause more blades to be used. I use the 3/0 spiral and go through blades pretty quickly. My last picture was the worst on blades. I feel it could sometimes be caused by the particular pieces of wood being used. I this case for a backer, I had a 1/4" piece of what looks like oak on one side, some filler and I don't know what on the other side. It was an old piece of plywood off the back of a headboard. I'm thinking it was hard on blades.(??)
But blades are cheap. So I don't worry it much.
Again, you did a beautiful job on your piece.