Again, I'm no expert, but it really sounds like reflux to me (my LO suffers too). It doesn't have to be projectile to be reflux and weight gain does not always suffer if he constantly feeds to make up for the loss (mine certainly does and is 75th percentile). Does your LO hiccup a lot? I would say this was the clincher if yes.
There is more info here and I know there used to be a reflux website I used previously, but I can't find it at the moment.
You can try propping up one end of the cot - use blocks or a wedge, there are lots of products around. We found this helped.
Also, from what I can work out, some BFd babies take a while to get the whole dummy thing. I would say keep persevering (SP?) if you think it will help
I know how you feel about your supply, I thought the same with my LO. But if your LO is gaining weight fine then you obviously ARE providing enough. You are so better of BFing, just think of all the extra milk you would be making/bottles sterlising with the sickness!!
Like Libra says, use infacol or something for the wind - your LO will eventually learn how to burp better. We found feeding position is important, keeping their backs straight, and that a sitting burping position with DS on our laps after feeding was the best way to burp (with a big cloth under his chin ready!). You might find lying him on his front helps to bring up any trapped wind too.
We also put a cushion on the changing table for his shoulders/head to try and reduce sickness during changes, and of course change him before you feed him.
Finally, found sitting DS up at every opportunity helped, in bouncer, on lap - I eventually perfected dressing my baby sitting up!
Sorry it's such a long post!
Good luck.