There are so many elements to gender swaying. Gone are the days where 'boys are faster and live shorter and girls are stronger but swim slower'. Things that many woman are looking into now to increase their chances of conceiving a particular gender include;
pH;
Minerals;
Diet;
Hormones;
supplements;
Timing, and;
Ions.

There is lots of info on this site that you may wish to read, https://www.bellybelly.com.au/forums...ation-6-a.html But for more in depth info you will probably have to look elsewhere.

As for success rates, that can vary depending on the how many of the factors used to sway and how diligent the individuals are when using them.

I swayed for a boy with DD#4, but now realize that I did not do a very good job of it at the time and understand why I failed, also even if it was a good sway it is never 100% guaranteed.

We swayed again for this pregnancy (with the help of a-gender) and we will know the outcome in 7 or so months