First the best thing when you have an issue is to create YOUR own thread, it is much more effective compare to bumping a 5 year old thread, the thread has now be divided.
Your snake is 5 years old it could be 6 to 12 months before he resume feeding, adults tend to take longer to adjust to their new environment, however you also have things you want to address the temps fluctuate too much on each side (you want to see a 2 degree variation at most) so 78/80 and 90/92 would be ideal.