Is this the bulb arrangement you suggest?
ATI Blue Plus,
ATI Aquablue Special,
ATI Blue Plus,
ATI Aquablue Special
ATI Blue Plus,
ATI Purple Plus
ATI Blue Plus,
ATI Aquablue Special
ATI Blue Plus,
ATI Aquablue Special
I would go with Grim Reefer's suggestion which is:
Blue
ATI Purple Plus or Fiji Purple
Blue
GE Daylight
Blue
ATI Purple Plus or Fiji Purple
Blue
Blue
GE Daylight
Blue
For a more blue look replace a GE with an Aquablue, less blue replace a blue with a Aquablue
If you haven't visited his site already I would suggest doing so. He has as lot of great information about T5s.