You can lower the transit power on radio1 to help steer it towards 0 and 2, although I have all three of my radios transmit power set the same (20) and the a/c clients connect to 0 and 2 as expected, so it might be something specific to your environment. You can also try cell density coverage (network>wireless>device configuration>advanced settings), I haven't tried it yet, but it might also be useful for steering, more info on it here.
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