I'm still not sure what the question is here.
Certainly you can use the term well balanced, either as a predicate adjective: The conclusion was well balanced or as a normal adjective: He has a well balanced personality. (note that I omit the hyphen)
A slightly more stressed version of this might be "finely balanced," particularly if you want to point out the someone has made an effort to make the thing well balanced.
But a "well balanced balance" sounds to me like a laboratory instrument (a balance) that is resting comfortably on the top of a Coke bottle.