The key to the platinum is tightening the straps, as JR12 said. I'm more tiny than both of you by a long shot (5'7", 132 lbs) and after awhile of adjusting, It stays put now. I was afraid by tightening the straps it would become uncomfortable but it actually, for me anyways, become MORE comfortable. I can't speak about the gold as I have never wore it. Good luck in your search.
-Josh
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