I don’t know what counts as “literary authors” for you, but for relatively easy to understand short stories I really like 星 新一.
In a class for university we also read short stories from 宮沢賢治. His’ might be a bit easier to understand compared to Akutagawa or Mori Ogai since he wrote children’s literature.
Also you could maybe have a look at https://yomi.ai to check how much you already understand from a certain author (if they’re public domain already).
Also, check out the master list of book clubs here on the forum!