I don't know about the 5 day feedings for a yearling boa...
I feed all of mine every 10 days. I have two 1.5 year old boas and an 8 month old and I just moved them from 7 day feedings to 10 day feedings.
I really think that the issue with the boa lies in the moving of the boa. I would advise leaving the 7 day (or 10 day) feeding schedule alone and feed in the snake's environment.
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