Why if it is regulated properly?
There is no need to drop the temps at all even if you are planning to breed. If you are fighting an RI I wouldn't drop temps at all, matter fact I wouldn't run them less than 93 to 95 period.
First thing I am thinking is scale rot on your pictures. There is never any reason to bath your snake unless there is a stuck shed. Bathing might be making the RI and rot worse.