The key is your front leg. If you're a right-handed batter, once you get your load and your stride you should either land and 'go', or and and 'slow'. essentially what this means is you already have your stride and are ready to swing. If it is a fastball then you land and go (swing), if it is an offspeed pitch then you land and slow (wait on it). it is important in both cases that you keep your weight back and then come back to the center with your follow-through (do NOT have your weight in the front at the end of your swing).
also, be sure not to leak. aka keep your hands back until youre going to swing. also, make sure youre upper-body is straight, not bent over.
since i wasnt exactly sure what you described as your problem, i gave you pretty much a lot of random stuff. some of which may be useful or may not.