I would get him weighed and providing he is sticking to a growth curve then I'm sure all is fine. My chunky daughter was a 91st centile baby but very rarely took more than 25oz a day (and that was generally a struggle!).
If he is not hungry between feeds, is alert and has plenty of wet and dirty nappies then he is getting what he needs. I wouldn't try the faster teat again really, stick with the no 2. Are you putting more than 4oz in the bottles? If not I would make 5oz bottles and just keep offering that until he is draining those bottles, he is still little so he may well start taking bigger bottles as he grows a bit.