First of all, for starting discipline priests it is important to get 20k mana unbuffed.
Your haste is a good spot now, but your crit should be 5% higher.
As you have no meta to care about, I suggest putting +16 intellect gem in the blue slots in your chest and belt.
That should raise your mana by 500 at least. Spirit and mp5 should never be gemmed for unless to complete meta requirements and then they are usually in combination with spellpower or intellect.
This is
the standard discipline spec , if you use greater heal regularly (which I do not, dont even have it on actionbar) then you can change the points from spellwarding to divine fury. Your glyphs are fine. Or if you use renew still, which I did when I first started raiding, put points into desperate prayer and improved renew.
Regarding your slow heals. Are you using powerword:shield enough? Because you should get plenty of haste from that through borrowed time. Penance does not consume borrowed time but is affected by it, so typical discipline priests that need some burst healing put a shield, cast penance on a low member and then add a slow but effective heal, in your HoL case you could use shield > penance > prayer of healing > shield > prayer of healing.
This is my discipline priest
http://eu.wowarmory.com/character-sh...erspine&n=Iebe
should you need some guidelines.
Also since you are high level tailor, put a darkglow embroidery enchant on your cloak.