If you swap an Aquablue Special with a Blue+, you will get a wider spectrum.
There's a guy from Nano-reef that tried a 50/50 combo (3x ATI Blue+ and 3x ATI Purple+) with very interesting results. I'm actually tempted to go that route. Another combo which seems like a safer choice would be 3x ATI Blue+ 1x UVL actinic, 1x ATI Aquablue Special, and 1x ATI Purple+.