I saw this and I wonder if this is the problem you are having with you & Toby. I noticed Sophie seems to show some of the symptoms and I think my overabundant supply is the issue. Sophie also bites, but only usually when my milk flow is at its fastest.http://www.kellymom.com/bf/supply/fast-letdown.html
We also have super fussy baby here in the evenings with cluster feeding which I though might be something I was doing wrong, but Kellymom assured me it is normal. That is what I was looking for advice for, but thought of you when I saw the above link.