I would add "Zen Roxy" to Together Alone. As the opening track. I agree with Mariola that the other b-sides just don't suit the album. But "Zen Roxy" really takes you away to that misty valley and black sand beach. It's no pop song but like "Kare Kare" it really puts me into the headspace that I want to be in to maximize the listening experience.
I do think "Skin Feeling" is a weak track, but the atmosphere of the album elevates it for me. I don't think the album would have suffered if "Skin Feeling" had been left off, but I'm mostly OK with it being there.