Yea, I think they're ok strength-wise. The AI is the thing that is just massively, overpoweringly strong but really doesn't make a coherent, focused attempt to kill the player. The hybrids do everything in their power to kill the player without holding anything back, but correspondingly have to actually be waaaaaay weaker than the AI (or else you just die, all day, all the time).
But if they're doing something markedly stupid (like throwing 3 hybrids at a citadel-world with no other AI attack happening there), I want to see that so I can fix it.