Well, why don't you make it into an experiment, assuming that you have the facilities. I've mostly read 15 on, 9 off and that is what I typically do, but maybe you could start a couple of varieties 12/12 and another set of the same varieties at something significantly different, and then monitor for stretching, stockiness, etc. I've always had stretching with IND varieties, and little or none with dwarfs and micros. And cherry toms seem the worst of all at stretching.
Good luck!
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