About PoJ:

While you are healing, tanking, or doing damage in Uldar, there is a crapload of "stay out of the black/blue/red/yellow/green crap" on the ground that everyone needs to get out of. What we are more concerned with is not with the lowered disarm duration of PoJ, but the movement speed increase of it. The faster you get out of the crap, the faster you can get a heal off after running out of it.

Now about Divinity:

Have you looked at a healing meter of yourself lately? If not, go run a heroic or 2. I'm guessing with the way you have your gear you are probablly overhealing at minimum 50% depending on what you do to heal: preemtivly use flash of light spam and occasionally holy light, or even more overhealing if you do a proactive holy light spam. In a 25 man raid setting with optimal raid buffs, your overhealing is probablly in the 65-75% range. Garreth overheals around the 69-75% range, and my paladin(Kaluu) over heals around the 70-79% range. A holy light with 0/5 divinity in your gear will heal for about 11.1k/crit 20k, while one with 2/5 divinity will heal for about 11.3k/crit 20.4k  a difference of 200/400. Now lets assume that you will overheal no matter what for about 60% of your heal (which i'm giving you the benefit of the doubt that your healing is so efficient). Do you now think that the extra 2% healing done by you ( the extra 200/400) and the way how paladins overheal is worth to be speced into? Or would you rather have the ability to "run out of crap" 15% faster and get to another safe spot to continue healing?

Oh, one more thing. Your boots have been enchanted with mp5. Consider using icewalker for the crit part of the enchant, not the hit part  of the enchnat.

Pursuit of Justice
Rank 2

Reduces the duration of all Disarm effects by 50% and increases movement and mounted movement speed by 15%.  This does not stack with other movement speed increasing effects.

Important part in bold.

In Ulduar you've got to do a lot of moving - the faster the better.