As I couldn't pin down ov, this seemed better o me than the risk of thinking it was O+12 and actually bding right on top of ov.
that's very true, O + 12 is a risk. You have to be really good with diet, supps, and all of the other factors. If you end up dtd right on O, but have done all the other factors, you still have a great chance at a girl, IMPO. If you're pH is low and have no ewcm anyway, then I wouldn't think it's such a big deal if you mess up on O + 12, kwim?
I used to be really scared of it, but honestly, I found it soooo hard to keep my pH low after a cut off...I did it, but had to check constantly. I think you need a TON of practice with O + 12. If you can NEVER get it right, then go for cut off..it's better to get cut off right than O + 12 wrong...but if you are getting the hang of it, I would go with O + 12.
It's a very hard choice to make, but I think you should be able to figure it out with enough practice