Gary, did you look at the break carefully? Was it the result of a crack that propagated from from a hole drilled in the tube, like at the masthead? If yes, there is likely a way to strengthen the mast locally to keep this from happening again. If not, there is probably little you can do in the way of add-on stuff that will help.

Structural metals take a very large number of 'cycles' to fatigue IF not stressed beyond their elastic potential (the point at which the deflection becomes a permanent bend). For steel it's many millions of cycles and quite a few millions for most aluminum alloys. Fastener holes are points of stress concentration; good engineering says that these spots should be made stronger than the rest of the structure to prevent fatigue failure. This is rarely done on a beach cat mast. Any strengthening/load spreading generally comes only from the fitting that's being attached. But the designers are fully aware of this and presumably compensate by making the whole tube thick enough to account for the most stressed areas. Excesive bending of the whole tube above the hounds is another issue altogether.

This implies that the mast is basically too weak to do the job you are asking of it. Since the M 6.0 is a relatively new boat, and designed since the chute became popular on beach cats, it's a wonder the boat came with such a mast in the first place. Of course, making it stronger would definitely carry a weight penalty, and the added weight would be in the worst possible place WRT boat performance, righting after a capsize and etc.

This highlights one key advantage for carbon masts. You can add reinforcement layers as needed to specific areas of the mast. Extruded aluminum can only be constant thickness, so if more strength is needed above the hounds, the whole mast has to get thicker and heavier.

Maybe the next thing in beach cats will be a second set of diamond wires and spreaders, just like big boats.

Jimbo