x2 doesn't work on chicks not bred for it. You can try it for fun, just won't work.Being trained is irrelevant. Wing sexing only works for chicks that have been specifically cross bred for it to work. It is like sex links that are bred to be sexed by colour but not quite so obvious. Contrary to popular belief, it does not work on all chicks.
I don't mean to spoil your fun, so by all means examine their wings, but don't read anything into it.
I am mainly posting this info because others will read your post in the future and then the myth about wing sexing is perpetuated further unless it is clarified. There is so much misinformation out there that just keeps being recirculated.