If a pitch was a 20 frame camera shutter shot the swing happens in the 18/19 frame for the professional hitter. Average amateur players make the decision to swing in say the 14th frame. Hitters should always search for more time. The more time you have to track the ball coming towards you, the more accurate your eyes can be with the barrel.
I hate, "get your foot down early" because right when you get your heal down your body begins telling your eyes, "swing, swing swing" That creates tension in the body and a tense muscle is a slow muscle. As hitters we want to be quick and accurate with the barrel. The biggest misconception is that guys like Paul Goldschmidt are foot down early guys. Its not true. Goldschmidt is a big guy that developed consistent timing with toe to heal front foot load. This load is simple but is the most difficult to master in my opinion because it is very easy to start the barrel turn with the heal still in the air (more to come in a later post on the different timing choices) I believe the shoulders/eyes control the swing. The shoulders are joints that control the rest of the body in hitting. Everything you do before the pitcher releases the ball is irrelevant unless you have a big leg kick and have to begin that before release. At release point your front shoulder should act like the scope to a rifle or pretend that the front shoulder has a red laser pointer attached and you want to line that up with release point. Early in the game your "scope may be little off but unless the pitcher is throwing 95 you have plenty of time to find the ball with your front shoulder. I believe the self talk is, "relax" at release so that your eyes can relax and track the ball. As I mentioned earlier, great hitters give their eyes time to track the ball. Hitters forget that the pitcher has to throw the ball to the catcher not to the plate. Amateur umpires make judgments based on where the catcher catches the ball not where it crosses home plate. I consistently see hitters making the pitchers job easier by going out to force contact in front of home plate or even worse moving up in the box for a variety of reasons that are all wrong. Make the pitcher's job hard, thats your goal as a hitter. Even if the pitcher is throwing 70, just start your load way later and make him throw the ball to the catcher. Track the ball with your front shoulder as long as possible and then at the latest possible moment be quick and accurate turning your back shoulder and barrel to contact the middle of the ball.
Two quick side notes:
1) In practice/cage figure out what zone YOU are most accurate in with your barrel. The umpires zone should be irrelevant until 2 strikes. Most are accurate on balls the are closer to their eyes, this is why the pitch down and away is a take until 2 strikes. Pitchers are taught to throw the ball there because its difficult to be accurate with the barrel down and away. Hitters want to take when he pitcher executes down and away for a strike. Pitchers can't consistently locate for strikes down and away. If a pitcher could throw an 80 mph straight fastball down and away for a strike every time that pitcher would not only pitch in the big leagues he would be in the hall of fame. They can't do it. Remember that when hitting. All pitchers stink and will make mistakes.
2) If you are not cheating to a certain location/pitch and your approach is just to react then you should set your front shoulder up knowing the pitch is a FBALL In then adjust front shoulder to a FBALL away, then off speed. That's the segment of time that makes the most sense. From release the FBALL up and In hitters have the least amount of time to track and the off speed pitch down and away hitters have the most time to track with front shoulder.