Honey and what is your problem...? He is having 6 bottles with 5oz each so is taking 30oz together, it's a good amount, unless he shows you he needs more. But I guess if he refuses 7am feed he is getting enough. I think it happens that children with reflux may eat less often and bigger bottles. You would like to get rid of 2NF?
I would say that you may either offer a DF or if a DF is not working for him, you could just wake him at 10/11pm and offer a feed. But I would expect him to wake at least once after this DF, but this way you can get rid of one NF which you probably do after you going to bed.
He may also surprise you and when he starts to get bigger bottles he may start to wake once at night for a NF. If this happens you also can try to make it a DF and hope he will sleep till morning.
3/4mo not needing to eat for 8h is possible. We were having one NF (later I transferred that to DF) from 6wo till 6mo. Not every kid does it, but it's possible:).