Greenscale - Hit, Focus, Toughness Requirements

[Dunharrow]

I've heard conflicting reports on the amount of hit, focus and toughness required to do Greenscale. I've tanked the first boss with 169 toughness, but am I at the cap?

Hit - is it 40% total needed, or 30%?
Focus - same as above
Toughness - Do you need 150 to negate crits, or 200?

I understand that talents can reduce the requirements. I just want to know the total amounts needed. If you have sources for your info, thats even better. Thanks!

[Pyros]

150toughness, 220focus/hit(technically 200 for raid mobs, 20 for the mobs being 52) which is 44%.