Accutane made my dandruff go away, but ketoconazole makes it worse?

I’ve struggled with dandruff for more than 10 years (I’m 30).

I was on accutane for several months last year, and I noticed that my dandruff went away, but a few months after stopping accutane, it came back (my acne didn’t). This makes me assume that my dandruff is seb derm & not a dryness issue or psoriasis/eczema.

But somehow washing with Ketoconazole (I tried both Rx and Nizoral) makes my dandruff significantly worse? I thought that ketoconazole was specifically for oily seb derm?

I’ve tried every other active ingredient available without a prescription as well as Ciclopirox, and nothing but Accutane has worked. Any ideas what the cause might be/what if anything could help? I was so hopeful that it was finally gone during my accutane course, and am feeling hopeless/frustrated.