Do you bowl straight, pitched slightly back of a length, on or just outside off at all? That would give you something to bowl as standard, then the inswingers are used as variation.
I tend to bowl a variation. I swing the ball both ways, assuming the wind isn't blowing too heavily, so I either try to plug away with outswingers and then bowl the straighter/inswinging ball, or swing the ball in lots and then the straighter/outswinging ball.
I am quite a short bowler, so I can't get away with bowling just short of a length on our wickets. Everything has to be full, and since I'm not bowling with pace, ie 70+, I don't have a huge amount I can do to beat the batsman for pace. I have put a lot of thought into my bowling, and I really like swinging the ball and seeing batsmen fall over or try fetch the ball, but I just feel I have lost my effectiveness ever since I started thinking! I did take a 5 and a 4 wicket haul in consecutive games last season, but had a few awful games as well!

Maybe the winter nets will be something to look at to work things out!
Some people say that if you bowl wider of the crease, it suggests that you are trying to move the ball in. I think one of the things I will try this season is bowling from different widths, as in one net, I was bowling inswingers and outswingers like I normally do, and the batsman was playing everything absolutely fine, but the moment I bowled from right next to the wicket and swung in a yorker, the batsman was clueless and bowled. (Really made my day as the guy is a good batsman!)
Oh yeah, please feel free to post your own tactics, as I didn't really make this thread to find out what I could do to improve my game, but more what others do. Oh, and is there any way we can lock this thread from batsmen? The last thing we want is for them to know what we will be planning!