Sorcerer Supreme's slow debuff.

So I just pulled her from a 5* M/S crystal. I opened two, other one was OG Hulk.
She can apply stackable slow debuffs. So I was wondering whether the reduction from each debuff also add up if I have more than 1 slow on the opponent or it remains fixed 100%.
She can apply stackable slow debuffs. So I was wondering whether the reduction from each debuff also add up if I have more than 1 slow on the opponent or it remains fixed 100%.
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6.2.6 Champion...
She do have class disadvantage but she can still apply slow. Because opponent need to be science class. And 6.2 champion isn't science there. I did with sorcerer that fight and her sp1 made fight easy
For Mystic champs Science has natural class adv. Universal class is not natural class adv or is it?