ofc u can allways experiment but as said by bigbudmike, just go with the 12/12 to be "normal" if there is a diference it will probably not even be noticed in a blind test. There is thread about just this going on, about 38 posts now and one 6th of them ended in flaming eachother for some ppl trying to win the internet or something.
I had 2 harvests so long and both by just going 12/12 and they worked fine =)