I agree with the previous posts, keep it simple and play safe when needed.
It took me a while to get use to this concept. Being a higher rank in local tournaments I play a lot of 8 to 3 or 7 to 2 races in 9 ball. With Alternate break that would make it a crapshoot on if I could win. But I've been working hard at not trying to run out every rack (this is where i'd eventually mess up and give a way a game or match). I run a few and play position for a safe, then if I can't run out from their I'd make another ball or 2 and play another safe. My opponents don't like it but it is effective. The last tournament my first 3 matches were 8-3, 7-3, 8-3 races... I won 8-0, 7-1, 8-0 and the one game I lost I had rattled the 9 ball. More impressive is that (besides the 9 I rattled) my opponents in those 3 matches never had a shot at an 8 or 9 ball, and the only time they shot at the 7 was if they were kicking at it.
It doesn't matter how impressive your play looks, its about how effective it is.