I noticed the footstep amplification too! It wasn't very obvious but once I switched to the silicone tips(which funnily worked better for me than the foam ones) I did hear it here and there.

I'm not tech savvy enough to mod cables, so I'll just bite the bullet and get a boutique one later.

I ended up finding the silicone ear tips more bearable than the foam/silicone mix (whereas the Comply foams that I had for my old setup where too long) haha

I do think it could be a problem on the 4.4 cable (testing them on the 2.5 didn't have the same issues), so I'll just see if I could get a new cable first.

Apparently the shop I go to provides Brise cables that work with IE600, but at the same time, there might be a few weeks' delay(something about it being custom made), so I'll pop over and ask about it. Thanks for the information nonetheless!

Is there a specific name for the connectors used for IE600? I'm thinking of visiting the place I bought the IEM at and getting a third party cable, but I'm not entirely sure if they have any that fit.

It does make it a lot easier to understand that way! I'll still have to take it back though, I don't think it's normal for the earbuds to lose sound if you press on it harder than usual.