You yourself said its a balance thing. So why would you want to be MORE egoless? you should strive for a balance.
I once thought i should give myself to everyone less fortunate than I. Then I realized there wouldn't be any of me left. You are right its a balance thing.
And the world is NOT just Good/evil, right/wrong, weak/strong black/white. Theres a lot of grey and mixed things out there. Is it evil to steal to feed the poor? What about evil to kill one to save many? Is someone who caves to a heroin addiction but puts their son through college weak willed or strong? These are just questions to prove than morality is more often than not a mixed bag, a balance, as you yourself have pointed out.
Sounds like you might be a bit borderline: "we are all either weak/strong willed", ""only two sides to a coin", might be two sides, but while its flipping in the air i dare you to tell me which is showing. Not to mention you forgot about the edge of the coin: most do. Most people, and shit, most THINGS IN GENERAL, are a mix of a lot of things, not just: either or.