From what your telling me, your husbandry approach is a bit too tight, that is, its too narrow for some species to succeed.
For instance, right now here, room humidity is 3%, lethally dry for herps. Where you live, perfect.
I would imagine your problem with boas was, too much humidity during the summer. I would imagine that plastic boxes and boas, with high humidity is a no no. I write this while I am watching my trio of rosies, ones gravid.
ALso working in zoos gives me an advantage as I was fortunate to work with all manner of herps. So I am not stuck with a narrow view of husbandry.
I sorta or rebuilt varanid husbandry, and I was lucky enough to include a term. It was, Life events, to be successful with varnids, they must do things or they die. Snakes are not different, only they don't die, they suffer thru it.

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• Cali king basking/night lamp? - pmqv, Sat Feb 15 08:28:04 2014
• RE: Cali king basking/night lamp? - Bluerosy, Sat Feb 15 09:09:35 2014
• RE: Cali king basking/night lamp? - pmqv, Sat Feb 15 09:25:39 2014
• RE: Cali king basking/night lamp? - FR, Sat Feb 15 09:52:15 2014
• RE: Cali king basking/night lamp? - pmqv, Sat Feb 15 09:28:53 2014
• RE: Cali king basking/night lamp? - Bluerosy, Sat Feb 15 18:12:41 2014
• RE: Cali king basking/night lamp? - pmqv, Sat Feb 15 18:21:46 2014
• RE: Cali king basking/night lamp? - FR, Sun Feb 16 09:24:00 2014
• RE: Cali king basking/night lamp? - Bluerosy, Sun Feb 16 10:31:58 2014
• part II - Bluerosy, Sun Feb 16 10:36:05 2014
• RE: part II - Bluerosy, Sun Feb 16 10:39:50 2014
• RE: who makes the choices - FR, Mon Feb 17 10:08:31 2014
• RE: who makes the choices - FR, Mon Feb 17 10:31:14 2014
• RE: who makes the choices - FR, Mon Feb 17 10:48:44 2014
• RE: who makes the choices - Bluerosy, Mon Feb 17 11:04:05 2014
• RE: who makes the choices - FR, Tue Feb 18 12:47:32 2014
• RE: who makes the choices - Bluerosy, Tue Feb 18 14:06:34 2014
• RE: who makes the choices - FR, Wed Feb 19 10:45:58 2014
• RE: who makes the choices - thomas davis, Sat Feb 22 21:40:56 2014
• RE: part II - FR, Sun Feb 16 13:06:22 2014
• RE: part II - Bluerosy, Sun Feb 16 15:20:08 2014
• RE: part II - FR, Thu Feb 20 09:26:51 2014
• RE: part II - FR, Thu Feb 20 10:07:01 2014
• RE: part II - Bluerosy, Thu Feb 20 15:38:25 2014
• RE: Cali king basking/night lamp? - Bluerosy, Sun Feb 16 10:55:15 2014
• RE: Cali king basking/night lamp? - tbrophy, Sat Feb 15 15:54:06 2014
• RE: Cali king basking/night lamp? - markg, Mon Feb 17 20:29:59 2014