I don't know where you are going with this either or why you thought this was your blog. But I know where I'm moving it.
I currently tank with a 50/8/13 build, I used to use a real gimmick spec to try to get the most avoidance talents in 2 trees but it gimped my threat and dps a little too much and did next to nothing for my damage in (so it seemed). I tried another spec where i could icy 9 times in a row and break 50k tps, but the damage output was garbage and overall damage in was also a little high.
I can't tell you how many times DS has saved me on HM's, same with rune tap and ghoul sac. The thing that makes blood better for most HM's is the fact of tank switches VB + Rune tap is up every switch for the "OH SHIT" moments. As well as a well timed DS (hence why Epidemic is a good for 2 pts)
I don't really know where i'm going with this other than my threat is fine, I don't get gibbed, and I can save myself rather than waiting for a clutch heal.