Well, your persistence paid off, those are nice pix!
The problem with breeding, is that you have to have two in the same tank w/o them killing e/o. in order to do THAT, you need a fairly large tank, with plenty of cover/places to hide.
However, having accomplished that, I find crays very easy to breed. At the lab, once the female is in berry (has a bunch of eggs underneath her abdomen... aka "the tail part") we separate her and put her in a large plastic bin with about 4" of water and holes punched in the lid. Once the babies hatch and detach from mom, you can put her back into her original tank... there to start the process over again.
If you just want more crays, I say go to your local stream and catch more, because it's probably a lot less time consuming!!

catching crays is as easy as finding a shady bank, a slow moving stream, and either... a) a willingness to get pinched or b) a bucket and some chicken liver. (place chicken liver in bucket, place/sink bucket right side up in stream... crays crawl in to get liver, you pick up the whole bucket). Traps are even easier, but buckets are cheaper!