If you like to follow your serve up with your forehand, you probably want to serve short (so the opponent can't attack your serve with a loop) and most often to the middle. Why?
If you serve short to the backhand, the opponent has a wide angle into your backhand. You'll likely have to follow your serve up with your backhand.
If you serve short to the forehand, the opponent has a wide angle into your forehand. To cover this, you have to leave your backhand side open to a down-the-line return, and if your opponent does this, you'll have to follow up your serve with your backhand.
If you serve short to the middle, you don't have to guard against any extreme angles - their return options are limited. The amount of potential table to cover is less than a short serve to the corners. (There's also the added advantage that the opponent has to make a decision between forehand and backhand. And since most players favor their backhand against short serves, this may leave them vulnerable to deep serves, if the receiver is already committed to a backhand receive.) So perhaps make serving short to the middle central to your serve and follow game.