Not an expert by any means but those are not ideal conditions for the snake. Way to cool at 67. Hot side should be 90 and I like my cool side in the low 80s. I also hate putting them in tanks as they don't hold humidity.
Feeding-the mouse should be 100% defrosted and then warmed. I usually let mine sit out for hours and then hear them a bit with a hair dryer. My snakes don't seem to want to eat them if they are not heated up. Also I have one that will only take live