Dr browns substitute?

Have any of you had success finding a bottle similar to dr browns? My baby loves dr browns nipples and the vent system does seem to help a bit with her reflux, but I feel like they leak a lot and the plastic seems very thin and not durable (although I know they make glass bottles, too). Any suggestions for something similar? We’ve tried mam anti colic which she HATES. Nuk simply natural we had some success with but now that she’s used to the dr browns she prefers a more rounded nipple. Any suggestions? We need something with a real slow flow, a more rounded nipple tip, and some sort of ventilation system. Ideally in a 5 oz size because 4 oz is sometimes too small but I don’t like the long 8 oz bottles.