Welcome!

Bump those temps up to 82-84 on the cool and 92-94 on the warm. A 55 gal is an enormous tank for a small BP. I would suggest something smaller at least for now. This is most likely causing security issues and is the reason for the striking. If you must use the 55 gal, put a bunch more hides in there and things to fill in the spaces like fake plants or even crumpled up newspaper. Leave her/him alone for at least a week to get settled in before offering a meal or handling at all.