If you want a hook that really digs in, then the Owner Cutting point is the answer. It actually has a flat surface, thus spreading out the load and stopping the hook moving.
As said, many of the carp hooks have a good gape and loads of strength, despite being small.
Some of them are available in a PTFE coated version which is a nice subdued grey colour.
As for Salar tube doubles, I noticed that when I tried to slide the 2 points into the foam on my fly box, it was difficult. When doing the same with the Ospery doubles, they went in really easy.
I am sure it must be the curved points doing it, because when you look carefully, the curve starts to dig in and want to turn the hook. As the curves face each other, they are both fighting against one another.