i dont think you can oversocialise these breeds. They have it in them and will come out when something is going on. My co is now almost 9 months.I did everything to socialise him.He is very sweet and gentle outside.but he can turn within a second when something is wrong.You doesnt want that when somebody is just passing by on the streets.So if you socialise him well he will act normal on the situations that you learned him but never underestimate them because it turns sround in a second when something is weird. You do fine with your dog.Dont worrie about oversocialise him. It comes out by itself but if you let it come out from the start you cant control it.Easy to learn than to correct behaviour ,bad behaviour.