I think tuning is overhyped. Just my opinion. I was sorta forced on this opinion. I started getting all my shafts from devoto sub and you basically cannot tune the flopper because it’s such hard metal. At one point I remember saying to myself who am I to dispute these Italian guys who are the master spearos. It’s worked fine. My opinion is if you really want to tune your flopper just don’t do it and get a double flopper shafts. I use single flopper untuned Tahitian. I cant stand it when the flopper hangs down as I swim around if it’s on the bottom.