More frequent bites?

[Homebody]

Should I take both of these at face value as completely separate instances? Or do snakes just become more prone to biting as they age? He’s never even moved to strike at me before...

You should take them both at face value as completely separate instances. The explanations you've provided for each instance sound like the most likely explanations. If you are more careful when misting and feeding, you should be fine.

Although, while two strikes in two weeks is probably a coincidence, it is a little weird from a BP that you've been keeping for years. If a more careful approach doesn't solve the issue and your BP keeps biting, then the sudden change in temperament does warrant looking into. Boger's suggestion regarding underfeeding is where I'd start.