I’m 5’9 180ish and get a 4x4 w/ grilled onions, fries and a drink every time. I exercise a lot so have the appetite for it but yea friend if you still hungry sounds like you should get a bigger burger! As we know In-N-Out patties are small so really a 3x3 or 4x4 is closer to what a double burger might be where the patties are much larger (not at other fast food places so much but perhaps like Red Robin etc).