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As far as my own upvoting, I would love to up vote everyone, but because a lot of my SP is going towards this bot and other entities like @introbot, I often drop below 80%, (right now it is at 73%) so I have to let things rebuild. I would let it drop further, but then I cannot protect the bots.

On the bot upvoting itself, this is how it survives at this early stage, plain and simple. Later, more people may do that. If the bot (or someone) does not upvote, then every comment would get hidden with the smallest downvote.

I monitor downvotes and upvote as necessary

Okay, I get it now...
That explains why some are upvoted and some are not :0)