The problem with what you're trying to do - and I've considered doing it as well - is that you're only taking your Attribute Points into account. All your gear has Mind on it, and when you switch to Cleric Stance, all those gear stats are tossed out the window, and you're trying to rely on the 30 points you put into INT.

Also, Cleric's Stance lowers healing output by 20%, so even if you could run around in full gear with INT instead of Mind, you would still be gimping yourself by 20%. Because if you put all your points into Mind and wore Mind gear, it would equal roughly what your INT would equal with 30 INT points, and DPS gear.