Don't just practice one kind of shot, rollover or pull or pullkick or whatever. You never know which shot you could perfect unless you fool around with every kind of shot. Lots of people start out trying to perfect, say, a pull shot, but from time to time play around with a front or back-pin. Then one day they realize that their "fun" shot is actually their best shot and very hard for goalies to block. It's possible to get really really good at some shots and be totally inept at others. The only way you're going to "find your shot" is to experiment and play around with all your options. There is just SO MUCH you can do on the three bar besides the rollover, so mix it up, play some razzle-dazzle and don't just worry about winning tournaments, learn to enjoy the game.