You guys have to do what YOU PERSONALLY can live with. There's never been a study done so we honestly do not know how or if YI sway (I personally really really strongly doubt it, but ya never know) and for some of us if we had to wait till we didn't have a YI around ovulation to TTC, we never would LOL.
I never really wanted anyone to skip months based on YI BUT this was the earliest days of the site (and actually one of my first essays that I wrote) and if I had come out swinging as hard as I do now regarding not skipping months and saying that pH wasn't adding up to me, I would have had no customers back then. :)
So long story short, I don't think anyone needs to skip months, but other "sway gurus" do, and thus you have to do what you can personally livewith.