Hello, welcome to the forum!
you have come to the right place for lots of info on chameleons and great people
this is a caresheet on panthers, has accurate info on their care and needs
https://www.chameleonforums.com/care/caresheets/panther/
your basking temp is a bit too high. do you think he is under or over 9 months of age? this will help determine where his basking temp ought to be.
this is a section of the caresheet i linked above:
Temperature:
Baby/juvenile (<9 months): ambient 72-80F (22-26C), basking 82F (28C)
Adult males: ambient 75-80F (23-26C), basking 85-90F (29-32C)
Adult females: ambient 75-80F (23-26C), basking 80-85F (26-29C)
also, for questions like these, about the care of your cham you will get many more responses if you post them in the chameleon husbandtry forums. these are the forums dedicated to the care of chams

i would start a new thread in the general discussion forum for this question and any others you have so that you will get as many answers as possible!

here is the link to the chameleon husbandry forum section
https://www.chameleonforums.com/chameleon-husbandry/