I'm afraid it will be hard to parse - with epic and AAs thrown in. Other people and their HOTs and their healing boon of various levels. They all get combined into one message. Plus I am told it works on regen, which will be completely unparseable. In addition, there will be crits that occur when you are close to full health that will not be displayed in the log. I have greater rabid bear too but I am not gonna hunt for that. I use anc. aid very infrequently. I use epic click often. I am always grouped with at least one priest who has a heal over time (druid SOTW+, cleric) that have healing boon as well. Finally, there's no way to parse my healing boon on HOTs I cast on other people.
Quick and dirty.
1640 = SS crit
800 = epic crit
666 = AAid crit
magic numbers
1466
1486
2040
2306
2373
2706
2773
3106
Looking for all those numbers, I find 133 crit ticks.
Looking for all cases of where I have been healed for * hit points by your heal over time spells(s), I find 617 ticks of heal over time on me that did any healing.
So yeah, that shows up as 21.6% which would be roughly on par with Healing Gift Mastery.