Don't worry about bottles. Also don't try to replace every feed with milk - better to go for solids from this age if he eats well.
The gymnastics are annoying, also kinda cute sometimes. It can be a short-lived phase, so that might settle down in a bit anyway. As for teeth scraping, try and pay closer attention to good attachment (gymnastics allowing) - don't let him feed if it's hurting you. He's old enough to understand that.

Try not to worry about what others think - it's nothing to do with them anyway. If you're weaning, or even just cutting back, try to take it slow to make it easier on him and reduce the risk of blockages etc. You can also call the ABA for more specific advice. It's hard to know where to start when you're cutting back but you may find that it actually works out easier than yuo first expected. It's also possible that if you cut back a bit, you might feel happier about continuing on a bit longer. I guess just see how you go.

Good luck!