Please keep comments and suggestions polite and let's have some fun making our Dragon Priest!~
DK healer is an awesome asset to a group, and I have also grown fond of that role.
For your setup I would argue you could contribute much more if you ditched the Sea of flames and took healing springs on the bar instead. Currently you do not have that many spells to crit with anyway. Energy orb is a great heal when aimed and timed well, but it doesn't travel uphill very well for example...
In regards to cp I hope you have invested red points in Bastion in such a bubble specc;)