Always look to villains 4bet and fold to 3b and act acording to that. If he's bullying you by 4betting allot, you don't want to see a flop with 66, etc, and i think the shove is perfect because you have + fold equity, and 90% of flops sucks to you. Obv, if you have a monster hand, vs this same villain, normal 3b size is fine, give it rope and let it hang him self
Ps: I don't play this 180's a lot, but this situations are equal in all sngs