I just got "The Bhakti Yoga Handbook" by Stephen Knapp for my Kindle. I've only read the introduction so far, and judging from that, I think this is going to be the perfect book to optimize my sadhana.
I'm going to use this blog to share the things I learn as I study this book and actually stick myself to a schedule. Haribol!
If If you want to get this book and study it with me, here's the link: