I wish I could help more with this but I don' have any good advice. Boas are a bit notorious for striking the front of the cage. Quite a few of mine do it and I have 2 that will do it anytime for any reason, just a really high food drive. I just try to move slowly when I'm in front of those specific cages as it seems moving by quickly is much more likely for them to strike out at. The worst thing I've had happen in almost 20 years of keeping boas is a lip getting caught on a tooth (with the help of my bf we pulled the lip back off the tooth and she was fine). These are boas that are not aggressive/defensive otherwise as well, as soon as I open the door and boop them with the hook, they are fine.