Ahh yes.... the power of a good male breeder.
Never thin the male herd till your young boys start to get the job done. We have plenty of holdbacks from last year in the 500g-700g range, but kept our proven breeders in the event the young boys did not step up. Always better to duplicate some of last years pairings than to end up empty handed.
Keep pairing them and your pairings will likely take off. A few young males did not lock until their 3rd or 4th pairing. keep in mind.... every couple you have in mind to pair will not always hit it off. Holding back 2 of the same morph males never hurt anyone if you have the space. Have a back up plan for every female if her desired male partner does not get the job done.
Just because you did not see a lock (especially with a young male) does not mean it didn't happen
Check the first post here and the video. This is how you can tell if your young boys are locking or not if you don't see it.
http://ball-pythons.net/forums/showt...Breeding/page2