So I've settled on the frames I like, the tubes I like, the pouches I like, the ammo I like and the shooting style it like and works well for me. I'm happy with my accuracy and all is good in the world. Then I got to thinking that the Snipersling pit pouches that I like might work well for shooting marbles with the Hai (ammo pinch) shooting style. Worked so well that now I think that will be my primary way of shooting. They work well with 7/16 steel too. Both style pouches work well, but the bike chain style one works best. Now I have to find the right pouch for 3/8 steel.
The lesson... Never be afraid to try new sling things!