Maybe the bot has become "smarter." When I posted my old blog posts upon joining Steemit, I didn't have this problem with them. It's bound to happen that these bots mess up every now and then, but as long as the team is learning and improving their algorithm.
I thought of an idea about creating another account dedicated to fighting bot spammers and get a significant amount of SP delegated by the community. Essentially, this account and any other accounts would participate by posting "booby trap" posts. Anyone that wants to contribute could make one of their tags "spamkiller" for instance. The title would be something completely innocent like "My Weekend Photos in Beijing" and one of their tags could be but the body of the post will be nothing but text that says "DO NOT COMMENT ON THIS POST OR YOU WILL BE FLAGGED." And all the bot spammers (or dumb people) would post things like "Nice post!", "Followed!" and get flagged to smithereens by my account and anyone else. There are some flaws with this idea but it was just something I thought of the other day.