I think you have a typo here. I've always thought in terms of 70/30 (dominated), 65/35, 60/40, and 55/45 for the most common situations, but same thing, really. It's just easier for me to remember the 5% shift in each situation, and while 2:1 and 3:2 work out in my head nicely, 11:9 does not.
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