I like it when my opponent thinks I missed a shot. Often times I'm just re-arranging the furniture so to speak. Of course I do miss but I'm not trying to.
If you want to see some strategy that can be tied directly into your 8 ball game, watch some 1 pocket. It gives you a real good idea of how to not leave your opponent anything. Of course in 8 ball there are more pockets but the idea is the same. Make your balls easy and theirs tough. I think it's Cappelle that has a "Play your best 8 ball" book. It's a good one that talks about strategy. That's what's so neat about pool, the more you play you pick up all kinds of stuff that wouldn't have even crossed your mind before. It's a fun game and I don't think anyone truly masters it. Sure they can beat other players but they still miss, and there's always something to learn.