Balance of each part of the machine depends to a degree on how much other parts require a 'counter balance'. The more motion, the more it must be counter balanced.
A true effecient machine has the least moving parts and hence is easier to balance without 'effort', so if you find that it is difficult to stay in balance, chances are you have too many moving parts in your machine, or you are moving them incorrectly (off plane). You may likely not be moving 'smoothly' as well.
I think any type of training that helps you become 'aware' of your balance is worthwhile. Depending on where you may be out of balance, different approaches can be useful.
The less effort required to hold your finish until the ball stops, the better your balance is likely to be. In a true swing, when motion is well balanced, you can hold your finish a very long time and feel very 'comfortable'.
If I am not mistaken Brian Gay sets up at impact fix and just leaves everything there. Certainly makes for less moving parts if you can do it.