"what do you guys do to keep your tanks insulated?"
I use PVC reptile enclosures and plastic tubs. While as mentioned both glass and plastic retain humidity the same, and it is simply the design of a fish tank that makes them unsuitable in this regard, plastic holds heat better than glass regardless of design (and so a plastic enclosure is more suitable than an ExoTerra even with the ventilation situation of the ExoTerra addressed). This is not to discount the foam insulation recommendations, especially as a short term fix (BPs are 40+ year animals, and I wouldn't want to deal with a rigged up enclosure for too long, but to each her own).
I use radiant heat panels and/or heat tape (aka heat mats) for heat. Heat lamps are good for basking animals, not so much for nocturnal animals. The few heat lamps I use are permanently affixed to an overhead mount and are not movable for safety.
Also, a decent reptile thermostat gives some safety. If your heat lamp was thermostatically controlled by a unit like a Herpstat, the thermo would have shut off the lamp when the probe temp dropped while the lamp was being powered -- a high quality thermostat can tell when some things are amiss, and do something about it. It sounds like you need three channels, so a Herpstat 4 would be a wise investment. Alternately, a PVC enclosure with an RHP or a tub setup with heat tape would only need one channel.
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