Pouch twisting sounds like a perfect recipe for fork or finger hits (ouch!), and does not induce any relevant twist to rounded slingshot ammo like the the "hop up" effect of an airsoft gun, never mind the rifling of a gun barrel. If anything, it destabilizes the ammo from its centered position inside the pouch. A standard linear release with the pouch aligned perpendicularly with the slingshot forks really makes sense, and is safest.
In terms of anchor points, I have settled for placing my right thumb knuckle on the maxillary cheekbone, and have been shooting very tight groups (one inch diameter) on paper placed on corrugated cardboard (at the 10 yards (standard competition distance) on my good days. It all boils down to a state of mind and high concentration. Like in archery, a fixed anchor point beats floating anchor points any day: in my opinion, it's much better to have a little less power but far more accuracy instead.
Better to leave the twisting to the musicians:
In terms of anchor points, I have settled for placing my right thumb knuckle on the maxillary cheekbone, and have been shooting very tight groups (one inch diameter) on paper placed on corrugated cardboard (at the 10 yards (standard competition distance) on my good days. It all boils down to a state of mind and high concentration. Like in archery, a fixed anchor point beats floating anchor points any day: in my opinion, it's much better to have a little less power but far more accuracy instead.
Better to leave the twisting to the musicians:
