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Joe, I've never seen your tank in person but if the pics are any indication whatever your doing now is dead on. I would just stay with it. But if your still looking for suggestions then when I was running T5 8x I went with 6 blue+ and 2 coral+. It's a pretty blue look though.
For my 6 bulb: 3 ati Blue+ 2 ati coral+ and one figi pink/ati purple bulb
For the eight bulb I would just add two more of the blue+ and coral+. If you like the color, add a pink and a blue+