You got that backwards J. Boids have a functional second lung. It's the colubrids with the non-existant second lung.
Temps should not be any higher than 92 for a Royal python when trying to get rid of an RI, with no gradient. What is the point of allowing a cool side when trying to warm the snake in order to boost the immune system? Regular DTH should be 88-90. Keep the humidity low until the infection clears up (take the snake to the vet for a checkup and possible antibiotics!). After it clears up, raise the humidity to about 60% and keep it there. Too dry or too cold will cause RI's..... You don't want to bake or make him soggy, either.... that's just asking for a whole new set of problems