I would try to find a different kind of balance. And if that wasn't possible, I'd prefer to be less stable and more functional...Because then I could have a better go at keeping myself stable as well.
But it also depends on how badly mood instability affects your cognitive functions.

All in all...I think you should definitely talk to your pdoc about this. You shouldn't have to put up with a side effect that has such an impact on your life.
There must be an alternative, be it a lower dose, or a different drug..