If he is draining the bottles then yea I would up to 8oz but I would try re settling them with a bottle to make sure it's not just needing to be re settling rather needing a bottle. I rarely give my baby bottle in the night now, but I do top him up (dreamfeed) at 10/11 pm so that might be worth considering depending when u go to bed.
Yeah I do tend to cause he loves head from side to side read that is them self settling be he has habit of putting hands in his mouth or rubbing his eyes which wakes him up fully. Will try 8oz today and see how we go. He does wake for a bottle in night which don’t might it’s the fighting going back to sleep and the stirring throughout that causing me to be tired xx
Moves
When he is stirring have you tried leaving him (unless he is full on crying)? I kept lifting my little girl and turns out she can get back to sleep herself within 5 mins, I went too soon!