Awesome snakes. I had a 1.2 trio WAY back in the late 90s. I stated on this site before I actually did get them to breed, which at the time I had no idea was an uncommon breeding, I just sold the hatchlings to a local pet shop and also traded towards a spectacular Diamond/Jungle Carpet, it's a weird story. A really interesting species even as adults they move and handle almost like large colubrids and they are such impressive strikers, lightning fast.
Are you keeping a sealed moss box in the enclosure? They love it.