I run my AIs at 32% both white and blue (two on a 30x27x18" cubish). I cannot suspend them so if I ran at a higher % would blast everything as the tank is shallow. If you can suspend them up higher your idea of getting fewer should work and you should be able to maintain the colour of your corals. I don't have many SPS but the colour is pretty good on the frags that I have.
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