You are reading incorrectly then. Because words of Mending casts another prayer of mending spell when you get 10 stacks. There is a whole section for prayer of mending settings and you can disable it completely in the dynamic part of the settings.
All's well that Heals well,
Bennyquest
Thank ya sir. I will check that out when I get home today. I dunno about being wrong though. A quick look on warcraft logs shows a lot of the higher output disc priest are not actually casting PoM at all. They are getting prayer of mending ticks from word of mending, but only a couple that I saw are actually "casting" the spell prayer of mending. And the ones that do hard cast the spell are doing it like 5 times.
https://www.warcraftlogs.com/rankings/7#metric=hps
Thanks again for the info though. I'm really enjoying the CR!