CURE Logo Revisions

OK, I'm looking for some serious feedback here. I inherited the CURE logo design when I came to CURE, and have been wanting to make some updates ever since. My train finally came in.

So I have a pretty restricted brief - basically just basic updates to the existing concept. The top version is what I've come up with, and the bottom is the original.

There's a lot of factors at play, and many of them are explained here. But I would love to hear any and all input on this one please.

Thanks!!