Thanks for your feedback.
I realized by asking this question that I might be coming back to an interest in kusala factors. When I first came across Dhamma I was all about loving the list of factors, trying to get them, but then perhaps wisely mived towards an emphasis on kilesa and undwrstanding how deep they are. Now slowly back towards an interest in kusala factors...?
Kammalakkhano , bhikkhave, bālo, kammalakkhano pandito, apadānasobhanī paññāti
(The fool is characterized by his/her actions/the wise one is characterized by his/her actions/Wisdom shines forth in behaviour.)
(AN 3.2 Lakkhana Sutta)