First, those cool side temps need to come up. 75 should be the absolute minimum. You should be aiming for 78-80. If he doesn't feel like he can properly digest he will not eat.
You also want to be consistent with your offerings. You're all over the place. Stick to what he ate last. Only offer every 2 weeks, at night, when it's quiet and he's in his hide.
Also, get a new vet. A vet that force feeds an adult snake doesn't have a clue about snakes. That may have even been a setback.
No handling the snake at all. Basically forget he's there's except to check temps and change water. I'm guessing no spot cleaning will be needed since he's not eating, but if he's drinking you may see some urates.