-half caster level still? At level 9, they have a CL of 4 and yet cast 5th level spells?

-The mercies are neat, but I think you should consider rolling some of them together. If you're only getting like 5 of them (table needs fixed for when mercies come, btw), that's exactly 5 things you can get cure out of all D&D. Some of them, like Staggered, really don't come up often enough. You could make it something you select from menus at the time of use instead of at level up. For example, every time you use Lay on Hands, choose 1 item from the level 8 list, one item from the level 10 list, one item from the level 12 list, etc.