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I personally dont think it matters. I have VHO lighting. I just have two actics in back and two 50/50 out front. I dont really know what type lighting you have.
I have a unit that has 4 54w t-5 bulbs. The way I have it setup is I group the two Actinics to come on one switch and the other 12k's to come on with the other switch. It's just me and you can do it any way that looks good to you. My third switch controls my moonlights and I have them all on timers.
I have them timed the same as you thincat. It is funny we just noticed the actinic are in the front, and both wondered if it mattered. I have the actinic on at 7 am - 11 pm. Daylight 9 am- 8:30 pm. and moonlights all the time.