Is Changing a super tampon every 5 hours bad?

No, changing a super absorbency tampon every 5 hours isn't bad.

Tampons should be changed every 4-6 hours - as long as the tampon is saturated then you are changing at the correct time. Your flow is on the heavier side but not abnormally so, tampons are made up to Ultra absorbency so as long as you're not leaking through highest absorbency within a few hours there's no reason to be concerned.

You may want to consider menstrual cups, these are safer than tampons so can be worn for 12 hours including overnight so a lot more convenient than tampons and pads for dealing with heavier flow. Cups can lighten flow compared to tampons, they hold a lot more than tampons so they don't have to be dealt with every few hours, and don't leak like tampons.