i think this thread would have benefited greatly from a discussion of requirements before discussing solutions. what do you want your sling to do?
despite being simple 100+ year old technology, slings are remarkably esoteric. even at camp perry, i'd be surprised if half the competitors had properly configured their slings. and tactical slings seem like a mystery to most people, who mostly give up and just use them like carry straps and even then can't figure out which arm goes through the sling.
maybe we need a sling education thread. i wonder if there are any good youtube videos someone could share.