Check this out, might help...
http://maintankadin.failsafedesign.com/viewtopic.php?p=289016 even though uncrush is off the table, the balance it provides in respect to block and somewhat dodge should still be a goal...see the link for more details
Link might also help you with other items you may not have thought of, such as rotation and talents, etc...On the surface your gear seemed fine for starting, but didn't really have time to review talents, block seemed a little low compare to dodge and parry.
But the other posters mentioned relevant points, alot does depend on the healer, how much xp they have as a healer and how close they meet their pre-nax/heroics goals. And I do feel you on your issues, and its always nice to see someone wishing to improve like this.