Tip sharpness and edge sharpness is the issue with fluke anchors not digging in, sharper tips will cut into the bottom.
These reviews do point that out with dull rounded points, those anchors do not set as well.
Take a grinder and make those tips pointy with sharp square edges, reshape the flukes to more match a Fortress shape and retest them.
I have thought to do that with some dull anchors, then torch braze with some bronze around the tips and edge them sharp. Idea being the bronze points wont rust and will stay sharp.
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