Fair enough, btw if you set your field properly, you'll notice a lot less edges going to "no one". They wont all be catches but maybe just a single or even a dot. Just try and plug the gaps where the most OP edges are getting through, and don't forget, if your getting edges in the first place, its only a matter of time before they go to a fielder or get chopped onto the stumps.
If its the slip area your having a problem with, just put in a short third man, they clean up all the edges missed by slips and often the AI doesn't even try and run a single. The ridiculous edges to backward point are my biggest gripe, but actually having a backward point (and gully) helps.