If your fans are wired up as you have it in the diagram then throwing the switch from 5V to 12V wouldn't affect the 172mm fan that is on the rheostat. Out of curiousity, how far can you turn down the Rotron and still get it to spin?
As for the switches, if they spin fast at what you think is 5V and slow at what you think is 12V then you most likely wired them up backwards. Got a multimeter? It isn't hard to either measure the output voltage or else to just check the continuity of the switch in either position.
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