That is a pretty heavy request, pun intended. TBH, the only way I have been able to get harder high gain sounds is with additional effects and plugins. If you have a stomp, or like me, a Nux MG300, you can get closer. You can also try Tonex or NAM plugins to help. I was able to get some Janes Addiction/Smashing Pumpkins tones using my MG300 and Tonex CS. This amp is, IMO, not really great for heavy distortion tones. Maybe you can get a used Spider or something along those lines to satisfy that itch.
This amp is really good at doing what it does, but heavy & metal distortion is not what it does best IMO.