Good thing turning the temp down. It should be the hottest area your snake can sit on that should be around 90F. Many people have a thermometer under the substrate on the hot side to make sure the temp isn't too high.
I was asking about your thawing method because I'm wondering if you cooked the mouse and that's why he spit it out. I let my frozen rodents sit out until they're bellies are soft and then heat them up with a blow dryer. If you thaw in water, I don't feel comfortable with water over 110 - 120F.
Waiting a week is good between feeding attempts. Also limit handling to husbandry only until he's eating for you.
I'd keep trying f/t - seems like he'll take it eventually. Leave it overnight if he doesn't. If he hasn't eaten in a few more weeks I'd try prekilled or live (but never leave a live mouse alone with your snake; make sure you supervise at all times).
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