Pally Healing

Ok, so one of my alts is a holy pally. I have about 1760 unbuffed plus healing and 24 percent holy crit. I notice that on overall healing meters I am usually one of the bottom 2 (with another pally) when we got to 25 mans. All of the other healers are priests with 2100-2300 plus healing. I also notice that I overheal more than anybody else. Is there a trick to pally healing besides spamming flash of light with the occasional Holy Light. I notice that on some fights like Prince (Kara) I will outheal everyone else by alot. Any tips anyone has would be greatly appreciated. Also, my libram sucks. Is the badge one worth picking up?