Hmm with your attitude not sure we can help apparently your doing it all right ^.^
Really need some WWS parses to see whats really going on but you might want to consider.
1. Go read up on gemming for parry (search tankspot as a start).
2. Your gear is hardly stellar for ULD/TOC 25 you are going to get belted yet you refuse advice out of hand without even trying it. How many times have you died with your CD abilities unused?
3. Are you keeping up thunder clap and shout debuff assigned to you.
Most of all talk to your healers and other tanks and work with them it's not an epeen contest.
If you really want to get to the bottom of it rather than seeking some sort of moral support to bitch to your guild about get some WWS parses and even rotate the tanks around.
** Remember Warcraft players fail in directions you never thought possible.