I am definitely going to look into the enclosure when it warms up a little bit. In the meantime, I have discovered that colder ambient temps make my print cooling fan wayyyy more effective, and as soon as that thing kicks on it drops temps enough to engage the thermal runaway parameters. I relaxed them quite a bit, but it still provides more cooling than the heater can overcome, so I will begin toying with fan speeds. Disabling it entirely has removed all thermal runaway cases, I just need to find out the ideal fan speed to retain the capability.