I've really been enjoying the Hifiman RE2000, but I'm back to listening and comparing with the Atlas today. I am trying the stock double flange silicon tips (medium) that come with the Hifiman RE2000 on the Atlas. So far, these are actually the best sounding tips I have tried I think. I am still getting the very annoying driver flex/suffocation problem, which only goes away with the marshmallow foam tips. However, the Hifiman double flange's tame the treble a tiny bit vs the CA single flange silicons, but still leave a bit of sparkle. Really enjoying this combo.