Here is a serious question, what do you lose by having a young adult rating? My comics is young adult rated, and I agree with the rating. "Series may contain moderate violence, profanity, sexual themes, mild nudity, and consumption of alcohol or drugs. May contain themes of self-harm, bullying, and abuse." this is a pretty good description of their baseline in my comics. And according to their rating, all ages can access young adult, teen and all ages, so this changes nothing for your viewership. Mature is the only rating that will change how people can access your work. So it's just a helpful rating for a reader (we can debate if it helps anything, that is another argument.)
PS. only thing I find annoying is no nudity, even partial, is allowed anyway so why have it as a category.