As for the soothing sermon part, usually if you have a good tank, a simple vitae should do the work, much less mana consuming if you kill at a good speed.
As for combat healing, maybe i see it wrong, i got the app4 version and i think it only raises the stats by one point, does it really help ?, i find it a bit costly compare to Vitae. When you know Vitae heals for something like 90hp per hit for 5 or 6 not sure how many heals, its like 3 to 5 time the mana effectivness of combat healing.
I mostly use these healing spells for patching between vitae or completing HO.