I think ghouls should not be so slow, make them equal as the mutans speed.
And dont give them +9 per, 8 is Ok, and at least 2 charisma, and maximum of charisma should be 5.
The bonus of them should be, outdoorsman +10%, since they wont use, energy weapons, and big weapons... give them 100% of small weapons, but only rifles and shotguns, no pistols and so on, and give them some basic melee dmg.
My Idea is, they should be slower then the humans, like the mutants, not so strong, and should have low endurance also they should have average high intelligence and very high perception, making them the perfect snipers.