Well for starters, you're over the hit cap. Thats never good. Secondly, you're having threat problems, not because of hit, but because of your talents/glyphs. Switch to the standard Deep Wounds 15/5/51 or 15/3/53 and glyph accordingly(just look for them here on tankspot, they are easy to find). Your gemming could use some looking at too.
If the people you are trying to run with say you need more health, you have 2 options.
1)Find more health
2)Find new people