A few more thoughts
- consider asking dir auths at what cw fraction they are going to start de-listing relays - to avoid wasting efforts (if you are lucky and get an answer from most of them share them with us :)
- maybe run without DirPort so you do not become HSDir for to many HSes
- your relays might significantly increase the overall churn rate, which means that some tor users have to change guard relays more often than currently (if your relays are around long enough to become guards) -> consider "recycling" your keys as long as they stay in the same AS to a certain extend (even if instances are "never coming back")
- maybe proactively announce it here before adding >50 relays/day
Looking forward to the first of your relays. (also because it will practically answers interesting questions like how big is to big according to dir auth ops)