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They are still random. 1.51% is just the most common.

How random is the algorithm @randowhale?

Specifically, what's the minimum possible % upvote and maximum, and more importantly what's the distribution? Is the probability of getting a smaller upvote the same as getting a bigger one?

I'm feeling like the percentage upvotes have drastically reduced recently... you can see on Steemd that upvotes of pretty low percents are much more common

Yes, exactly my thoughts.

I am guessing the % is correlated to the voting power. This is unfortunate. @randowhale was the best service.