In simple terms, you don't if that's the desired design. To really balance something like this it would require abandoning the current iteration and redesigning. That's a large step at times and not always warranted based upon the history of the mark.
The Nike logo is not a balanced logo either. However, you are using it backwards. (Unless you look at the shoes from the left side :)
) The swash specifically goes up and to the right for a reason - to promote good, happy, impressions. Imbalance in this direction also promotes the sense of movement or motion - which is fitting for Nike products.
For an unbalanced logo in its own, as much air around the logo helps. The imbalance it's perceived as motion or movement more if it's not surrounded by other elements.
In a layout, the key is to use other elements to make the logo appear more balanced. Essentially you imbalance a layout to counteract the logo. i.e. play of the imbalance more than fight against it.
Since you used Nike as an example... Examine a few Nike ads and see how they offset the placement of the logo or placement of other elements to rebalance with the logo....
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Some marks are simply not balanced. That's not always a bad thing, but it does mean a designer should be aware of it when designing collaterals.
I agree with others that curves and angels could be refined (top angle of eye should match the angle of forehead, top of head could be smoothed or sharpened more depending upon desired aesthetic, etc.), but I don't think that has anything to do with the overall balance.