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My situation is similar to yours in terms of "from accounts with very little SP".
The downvoters are usually accounts with 15 Steem Power.
Many of these accounts are only downvoting.
I usually get 1-2 downvotes per post. Mostly (almost always) from these accounts.
Once or twice I saw downvotes from accounts with around 80-90 Steem Power.
Maybe there were also downvotes from accounts with more than 100 Steem Power, but I currently do not remember seeing them.