Intellectually, I'm more comfortable with balance - symmetry. In reality, I know that this is rarely possible at any given moment. So, I fall back to the useful position of asking "is everyone getting their needs met and are comfortable with the situation?"
If the answer is yes, why conform to some ideal notion of equality for equalities sake? If you maintain the option of being poly, yet choose not to because of how you feel about being completely filled up, then I don't see the need to worry about the optics of it all. Just let go and enjoy.
If you don't think you can get your needs met that way, then that's another story altogether.
Male, Straight, Poly
“Instead of getting better and better at avoiding, learn to accept the present moment as if you had invited it. And work with it instead of against it. And making it your ally rather than your enemy.”