The friendly enclaves get younglings that are 4x as powerful, but they get 1/4th as many of them. Each enemy enclave can deploy just as much firepower as a friendly enclave. It would be more consistent if they all used the 4x younglings, but it wouldn't be a big balance change.
The problem is, the way Roaming Enclaves works, every so often it spawns an independent enclave, an AI-friendly enclave, and a human enclave. However, the human-friendly enclaves tend to be far more cautious, especially if you use the ally-config options to keep them at home until they build up into a massive fleet. The AI-friendly ones tend to attack and get killed, so there's never very many of them at a time.
The AI-friendly ones probably need to either spawn in greater numbers, or to have better logic that helps them stay alive. That would balance the faction a bit better. Right now, it's very friendly to the player; minor border aggression is a small price to pay for having the friendly roaming enclave fleet scour threat and protect your homeworld.