well, it sounds like you are on your way to things being perfect. keep on with the tweaking of temps, but given the fact that you are doing a way better husbandry job than the last guy (temps in the low 80s... wow) things will steadily improve for you.
picky eating can be frustrating, especially when a good feeding response would reassure you as to your overall husbandry. just be patient, it will come. prescent the room for an afternoon with a mouse, then shortly after nightfall, try to feed, if it was me i would have both a live mouse and a live rat on hand, just to give it my best shot. also if it doesnt eat, give it a week and try again, dont want to reinforce a non eating pattern.
hope some of this helps. i am sure there are far more experienced keepers who will chime in, so good luck. and remember, you already have a snake, too late to second guess now whether you should have one. keep on trying as hard as you are now and you will do fine.