I´m hector and I had the worst acne I´ve ever seen live (Sorry for my bad english i hope you understand what I mean).
I will tell you my isotretinoin story, I´ve been taking that for a long time!:
Hey man, I'm glad you found something that worked for a while. Idk if you've tried probiotics but they pretty much cleared my bacne all by themselves.
I don't think 20mg a week would be enough for me either. I'm still taking 10mg every other day, and that seems like the minimum amount to keep me looking good. That averages out to 35mg a week, so maybe you should try 20mg twice a week?