Didnt you read my prior post 9my first one, that says breed het offspring back to mom, then breed the male visuals from that back to the females of the first generation of snakes)? You will greatly increase your chances, and if you dont produce the visuals you can keep your double het male. If, of course, you produce the correct snakes.

And, yes, a lot of breeding is luck. It's all a game of dice and you're betting that resources will be ready and that those resources will turn up a few diamonds.