To make it short, it seems that if you put 3 points in the feat "Presence of Mind" under the General tree (removes 20% casting time on certain heals per point spent),
your Life of Set healing spell becomes instant (though it should only have been 60% faster), but when you put the fourth point in "Presence of Mind" it's no longer instant, it has the cast time it's supposed to have (80% reduced).
I'm not sure if the other healing spells are also faster than they should at the third rank in 'Presence of Mind',
but I figure you could save a feat point or two, since you almost always use Life of Set more than the other healing spells
your Life of Set healing spell becomes instant (though it should only have been 60% faster), but when you put the fourth point in "Presence of Mind" it's no longer instant, it has the cast time it's supposed to have (80% reduced).
I'm not sure if the other healing spells are also faster than they should at the third rank in 'Presence of Mind',
but I figure you could save a feat point or two, since you almost always use Life of Set more than the other healing spells