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Both together. Soon to be sold on etsy as a bundle.

The one with 2 legged suspension is a bit wobbly, but it's not too bad because the pouch has some sink to it, meaning the center of gravity is a bit deeper.
The 3 legged y-sling has excellent stabiltity with the release slit being wide enough for the ammo to pass through.
4 legged suspension could work, but then the suspension strings would be closer together again thus  acting as a single 'wide' string, but yes it would add stability. Yes, having them split very close to the pouch would be how I would do it then. I'll consider it for the next one.
As to the Jewish comment, I mean no insult to them, it's just that it looks like a yarmulke. If others here think it inappropiate I will delete what I said.

This design is interesting. A few tests are necessary to valid these slings.