goodroi - 5:32 pm on Jul 20, 2013 (gmt 0)
You might want to check out these earlier discussions about possible brand signals:
What creative ways can you stretch $100/week into brand signals? [webmasterworld.com] June 2013
How to look like a brand [webmasterworld.com] Dec 2012
How do little brands become big brands [webmasterworld.com] Nov 2011
I would humbly disagree with some of your suggested signals like "Not an exact match domain" because popular brand names can also be highly searched terms which would turn their brand domain into an exact match domain. Also some big brands have many affiliate links on their sites (I'm not sure but would guess most top traffic sites have some affiliate or outbound redirect).