I'd be very interested in seeing the same sort of thing where the number of rounds is randomly chosen and they don't know how many rounds they are going to go up against.

Note that the CliqueBots failure is not a good reason to think that Cliquebotish like strategies will fail in evolutionary contexts in real life. In particular, life generally has a lot of conditions to tell how closely related something is to them (such as skin coloration). In this sort of context cliquebots are losing in part because they need at one point to defect against themselves to do an identity test. I suspect that if strategies were told in advance whether they are going up against themselves then Cliquebots would do a lot better.

P seems to be a much better designed CliqueBot than Q especially for large sets. Five defections is a lot to burn, and in fact it does go away well before Q leaves.

One other thing that might be interesting to see what sort of environments which strategies will do well in is to never reduce the number of copies of any strategy to 0, and have 1 be the minimum.