If I were him, I would be looking at some of the other dps before you :)
And the reason why your haste seems so low is you gearing choice. Look at how many peaces are itemized for dodge/parry. It isn't bad at all for tanking, but if you want to add damage too, you'll have to look at gear that's itemized for haste/mastery. Your group can either decide to let you compete with rets and dks for gear, or let them have first pick while taking the leftovers for yourself.
I think this is what is causing your damage to be undesirable. If you look at some of the ranking prots on WoL, they use haste/mastery gear almost exclusively.http://us.battle.net/wow/en/character/shattered-hand/Vilesilencer/advanced
This guy is at a higher progression/gear level, but it's still important to note his gearing strat and the fact that he's ranked 1 on many WoL fights for prot. Keep in mind, this is still effectively tank gear too; he isn't trading out damage taken for this.
I won't be logging in for a few days, so I can't use my tank set as an example. I'm using ret gear with a sword/board because we were on garalon. That's a fight where tanks take very little damage, and the enrage is tight. So if you can use your ret gear for this fight and stay on the front two legs while soaking swipes, you should be able to compete with the ranged at least.
I switch between prism and Hammer for 90 talents, I've never even tried ES because I prefer the extra off-healing. One of the things that pallies can do is use their active mitigation (vengeance) to heal others. We have our passive healing from Battle healer and Sacred Shield, but we can also toss out WoGs and FoL if we arent hurting too bad, often for 100-200k heals per cast. I do this a lot on fights like tsulong, where I've just traded threat with the tank and cannot afford to damage because my vengeance will rip aggro back. 20-40k depending on the fight is entirely possible.
So once you are ok with your damage, your healing, both self healing and off healing, should be picking up too(I'm pretty sure it scales well with haste) And that is something that your warrior can't even compete with. For fights where you arent taking massive damage you can take clemency over Unbreakable spirit for even more utility.
I think the utility is what makes us stand out over all other takes, and you may have to take advantage of that if you feel you aren't as desirable.