I know that this is an old topic, but...
I both agree and disagre with this comment. Evolution is a tricky thing! While some snakes can regulate their own incubation conditions, (mainly the giant pythons) the eggs laid by those snakes are far less capable of surviving even small changes in those conditions. Conversely, the eggs laid by snakes that are not capable of self-thermoregulation (like the Ringed pythos) can easily survive small, temporary changes in their incubation conditions. Since, if conditions are not perfect, the mother must leave the egss to bask or cool for a shor time, the egss are somewhat hardier.
So, with "non-quivering" snakes, the mean conditions, in the enclosure do not have to be as steady and perfect, which seems to represent better chances with maternal incubation. However, this also means that your enclosure must have several, more specific condition areas, that DO have to be more perfect. 6 of one.....
The bottom line is that if you want the largest percentage of successful hatchings, I believe in artificial incubation, regardless of the breed or its thermoregulation capabilities. I simply find this stuff fascinating! Best of luck Mitch! - Brian