strike a happy medium
strike a happy medium {v. phr.}
To find an answer to a problem that is halfway between two unsatisfactory answers.
Mary said the dress was blue. Jane said it was green. They finally struck a happy medium and decided it was blue-green.
Two teaspoons of sugar made the cup of coffee too sweet, and one not sweet enough. One heaping teaspoon struck a happy medium.
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Source: A Dictionary of American Idioms