It seems to me, there is two parts to balance and coordination...
You know the relation of the ear to balance, right? So there is the sense portion and then the muscle response portion.
You can work on muscle response through agility training and unstable surface training, the sense portion is probably going to be genetic. Don't go too bonkers on unstable surface training. No need to buy a bosu or balance board. You can simply utilize exercises that require greater balance: lunges or various kinds, supine hip extensions with a swiss ball, supine hip extensions with leg curl, etc.
Agility would be running cone slaloms, squares, 8s, etc.
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