Diablo 1 HD Hellfire Mod | Awake

is there a monster power scaling table/chart anywhere?

I kind of made one in google sheets

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it doesn't have damage or droprates factored in since I don't know how to calculate those.

but it seems it is far more efficient and faster for me to do player 5 then player 10.. anyone else notice what difficulty has been most efficient for them?

There isn't, maybe someone can look for it in the game files, someone who knows how. I've only played on 10 and cared about loot, not xp, but from what you noticed i agree that 5 seems most efficient to get xp and not have such a long run as on 10.