I think I'm going to try out the 70's. In the past, I owned the CKM500's and they quickly became my favorite IEM's. Something about the sound was just so fun and they felt full of life, but they just did not fit my ears at all. Those large driver housings pressing on my ears caused pain after short stretches of time causing me to have to give them up. Was appealed to see these new models are much smaller. Lucky me too, I have a pair of Phillips 3590's collecting dust I can steal the tips from. If they feel like those headphones in the ears, I'm golden because I didn't mind wearing those.
Oh, and by the way, those Phillips IEM's actually do sound quite amazing considering how cheap they are. They have a huge amount of bass.
I have very small earcanals as well (always end up with size small or even extra small tips) and the CKN70's with the small tips from the 3590's gives me a very comfortable and tight fit. Hopefully it will work for you as well.