Whoohoo! So glad you approved of how I put them together.
I didn't really mean for Ron to be a complete berk in this, although I've never really liked his character. He and Hermione just have very different tastes, interests and expectations. After a while, I can see the novelty of being together ware off, and Hermione would want someone more on her emotional and intellectual level. And background, since she, Harry and Snape all grew up in the Muggle World.