Stoneblood with 40agil/40 stamina food, and I carry 60 indestructible pots with me.
I think people are forgetting the avoidance and dmg mitigation of expertise by not using Rhinolicious Wormsteak. As a food buff i dont think it can be beaten by any other food in terms of what its usefulness is.
For normal progression I generally use Stoneblood for the health, and Rhino meat for the expertise. Expertise = more threat and some survival. However, for normal modes go cheap, use fish feast and don't flask.
For example my guild is, Conspiracy, on shadowmoon. Quite a few people in the guild pull 10k dps. So, threat is surely an issue. However, on some fights, like anub hard mode (where you are attempting to get unhittable) stoneblood & expertise isn't the way to go in my opinion.
On a side note, for farm status shit, I still use a flask (perhaps i always will) but I usually eat from the fish feast that is provided, and have yet to lose agro from doing so.
I use the deep wounds spec as my single target spec. I also have vig glyphed and normally pull around 10k tps (with 2-3 forms of md).
The only fight where threat is an issue is lady Deathwhisper, but this is caused by a debuff not by failing to eat or flask.
I don't know that this closes any questions but its what I feel works best for me.