actually I tried those foams, today.
with regular rubber tips, I was getting not much bass (even with the biggest one, but my ear canal isn't that big. I had no problem with mid size tip when I used ex series)
So I just tried foam tips by curiosity, yes it's huge.
but I just managed to insert it in my ear.
result, I'm getting boom bass that I missed from the beginning with JBL.
I thought 220 is kinda earbud lacking bass, but with these foams I changed my mind.
However, it's bit annoying to put in since it's huge.
I think I will get some foam tips from other manufacturers, like shure to keep enjoy this bass.