Pigeon narrow bottle teat collapse

Hi my 8 months is using dr brown narrow bottle but i find it a hassle to wash and change to pigeon narrow bottle. My Lo able to drink from pigeon bottle but the teat will always keep on collapsing. He is using Y cut teat. Its quite irritating that i have to keep on opening the bottle and pull out the teat.So i change to L size instead but it is too fast for him? What teat should i use? I tried changing to anothe bottle like tollyjoy but he still prefer pigeon. He doesn't like the wide type.