Here is my idea to assist you.

You can try running a script to see who comments post on your blog, who replies to your reply and where you comment the most and who replies to when you leave a comment.

Now you will have a kind of like 2 lists containing four matrix of measurement. It's not hard to run the code believe me.

Now you can manually read top 50 names from these two lists. The authors or commenters should be saved in your memories as the are top 50 in your engagement game. Now just separate good eggs and bad eggs. Now u will get atleast 50 users to select. This will reward where you give your most attention and who gives you attention.

I know it kind of like a different approach and some might disagree but it also involves human decisions to decide where their votes go. Also following trails at a certain x % futher divides the votes while at x % rewards your selected authors.

If it's complex to understand my sentence structures or way of saying, please let me know. I will try to rephrase it.