People probably wont agree with me though and tell you to stack willpower... I just disagree and my LInear Solver spreadsheet tells me that this is the best way to maximise heals per second. You wont overheal as long as you know what you are doing and start your heals at the right time.
I will disagree with you. If you look at the ratings/stats you can get from augments (252), you can get a total of 55.8 bonus damage and 2.186 crit chance from the willpower after buff/talent bonuses. In order to get the same crit chance from rating you need about 50 crit rating. This leaves 202 power, which yields 46.5 bonus damage. Thus, will power is better. This is not even counting the fact that the crit rating curve gets steeper faster than the crit chance from will power, so you would need even more crit rating to equal the chance gain from will power.