Not a book, but there used to be a continuing monthly thread on home-barista called Roast and Learn Together where the group would pick a coffee for the month and contributors would post profiles / brew parameters / cupping notes. As with any forum, you have to sift through the BS to find some gems here and there.
Also, something I found productive at the last shop I worked at was sharing a shift behind the bar once per week with the other roaster at the shop. We would spend the shift brewing/refracting/tasting/philosophizing/planning. We found it to be a productive way to generate ideas on chasing more nuanced flavors that we couldn’t always pick up on the cupping table.
I hope all is well at Methodical Coffee. I grew up just 20 mins outside of Greenville, so it’s good to see some specialty coffee in that area. I’ll be stopping in around Thanksgiving to taste what’s hot.