Very sweet colours, really like it

Yes, the lines might be a bit too much stretched, but since it's function-based you have to start with that as a base, so perhaps you might just try to displace them a bit more.
Regarding you clipping GI: do you perhaps use any very small scales in your terrain? I've occassionaly the same problem when using exotic displacements. It doesn't look like you have those, but perhaps some very small scale stuff going on? Sometimes it helps to replace your planet and atmosphere with a new one.
Martin