Should I be concerned?

So what are the temps with the new thermometer? Postlics.of your setup

Mouse or rat hoppers?

If you have to change things, change them slowly and see if they help. If you change everything at one time you will never know what was wrong so you won't know in the future what to look for. By the sound of it, it sounds like your temps are just too high on the cool side.

Mouse Hoppers. and the temperatures have gone to 79/80 cool and 88/90 warm.

Temps are perfect and the snake is eating so no concerns about stress. Mouse hoppers are quite small it may just be looking for food. I would suggest 10% of the body weight of the snake per meal I feed small snakes (under 500gm) every 5 days and every thing else every 7 days. Fully grown adults often get a but smaller about 7% mass. Mouse hoppers are what 8gm so they would be fed to an 80gm snake usually a hatchling for a couple of meals I would start on adult or jumbo mice for a meal or two then try to switch to rats. It would be a pain feeding 10% mass to a 4000 gm female @ 50gm each it would be 5-8 mice per meal.