Yes, all of these are right! I'm really pleased you recognized 8, which I wasn't sure anyone would get, and yes, I mainlined the Copper Crown series when I was in middle school, which is where I fell in love with Welsh myth/lit (well, the parts that were still holding out from The Dark Is Rising sequence, that is). (Hmm, that means my chronological ordering is wrong... oh well.) I totally loved that series! I suspect though that if I read them for the first time now I would be mildly irritated by them, but who knows?