Sounds like your guy is hungry, even one jumbo mouse a week isn't really enough. I bet he's striking because he can smell the feeder. I would switch him over to two f/t mice and then a f/t small rat each week - you may have to scent the rat with a mouse for a while to get him to take the rat.
You also need to interact with him on more than just feeding days, or he will associate the tub opening with being fed.
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