Preparing for Zul'AmanFollow

The guild I am in is looking to progress into Zul'Aman and I just want to be prepared for the step up and was hoping to get a little advise specifically on what to do about some gems.

My Armory

I am at 180 spell hit, so 16 over hit cap. I am planning on replacing 2 of my +8 Spell hit gems. My unbuffed fire damage is at 1040. Is this enough to start looking at a little Spell Haste here or should I just concentrate on going for more Spell Damage when replacing the hit gems?

Currently I am using the Spellfire set, when I crafted it I was a little short on HP so decided to match the sockets. The blue socket was filled with a Gem with Spell damage and stamina on it. I am upto 8423 HP unbuffed now and was looking to break the Socket bonus and put spell damage gems in the blue sockets. Is this something I should be doing or will the resulting loss of HP cause me problems in Zul'Aman and any 25 mans we may make it into (Small guild so dont quite have the numbers for 25 mans yet).

Finally, I am currently using the Vengeful Gladiators Silk Cowl with a Chaotic Skyfire Diamond and the +12 spell damage gem you get for honor points. I have the pattern for the Spellstrike hood and was wondering I may be better off crafting this instead, or is it really not worth it without getting the Spellstrike Pants too? Also I am at about 25% fire crit and wasnt sure how much I would miss the Meta Gem for both the increased Crit rating and the increased crit damage.

Thanks for reading and I think that covers everything, unless anyone can see something obvious that I have missed.