Non Human Signals: Why are Medium Threats so Rare?

[cocoapuffs1000]

I am trying to learn to use shard cannons and have been hunting for Cyclops in Thargoid systems. The vast majority of non-human signal sources I find are threat 4 (scouts only) or Threat 8 (high level interceptors). In fact I can't ever remember seeing a threat 5 or 6 nonhuman signal source. I've tried other signals like combat aftermath in the Threat 5-6 range but those are rarely productive.

For a while I was getting interdicted by a single Cyclops fairly frequently, but that seems to have become more rare (more often it's scouts or multiple interceptors). Am I missing something here? Are there system parameters I should look for that make mid level threats more likely?

[Sighman]

Threat 5 is cyclops, normally, but if you go to a threat 4 an interceptor will show up if you stick around.

Same with 'Capital class ship distress signal' and many other signals in the system.

Otherwise, why not go to an AX CZ in any Thargoid system? They start with scouts, then cyclops.