I really admire you for being a surrogate mother. What an amazing, selfless gift.
DH and I want a girl, but after reading the book "How to Choose the Gender of Your Baby" I wondered if we would be able to get pregnant with those methods. It said to have intercourse four days before ovulation, and then not again until the next cycle.
After the day is done, it really is still just a theory and isn't proven one way or the other. It made more sense to DH and me to have intercourse closer to the time of ovulation. It just didn't make sense to do it when I'm "kinda" fertile, and hope for the "girl" sperm to live long enough to fertilize the egg KWIM?
In your case for a boy, I'd be afraid to miss my ovulation day.
The idea of swaying is interesting, but I'm a bit leary of it personally. JMO, I know a lot of women on JM have used it and achieved the gender they were hoping for.
As for the dates, those calendars usually go by when women are statistically the most fertile and may not be entirely accurate. You'll want to look to your own body for when you are actually fertile.
Oh and welcome

This is my first cycle to be here as well.GL!