I don't like your maths.
Either way, the build that I described could happily take extra turning and equip amara's (or another +turn item) and be quite similar to yours if desired.
With your build you will end up <5% better at healing. In contrast, you can be <5% behind on the healing but be a fully fledged divine caster as well and able to throw it down with the big boys.
It is a well established fact that healing isn't a full time job in DDO because, well, it isn't that difficult in 95% of the game. Damage comes in dribs, drabs and spikes and there is a LOT of downtime in which no damage is coming in and if all you are doing is standing around looking at red bars then you are a waste of a party slot.
Perhaps you need to be enlightened?
(this is a link to a forum thread that every player should read)