Hello,
First of all you're on the right track. This is gonna be my 5th season and I did a lot of research for the 2 years before breeding. I asked a lot of questions, watched videos and came up with my game plan. The first season, I bred 5 females with 2 males and got 4 clutches. This past season, 16 clutches of 18 19 pairings. You're following the main schedule that I do as well, 3 in 4 out. Just gotta be patient. It is early, I just started pairing and have only seen a couple myself. I have a couple males that I rarely catch locking but do get clutches every season. So that's a possibility. This is your first season, as it is for your males. Sometimes they take a little while to figure it out. Some tricks you could try is to take the shed skins from your other male and place it in with the paired snakes. Also, If you know how to pop the males and check for plugs, take the plugs from the male you're not using and rub the plugs on the back of the females. These seem to spark a little competition with the other male. Mainly be patient and try not to disturb the pairs too much. Take a peak and leave them alone. Good luck and keep us posted.
Mike