Thanks Kirby, appreciate the recommendations. I don't use them too much anymore myself, but I'm feeling like I'm treading on some of the same old turf on a few things and I was hoping for some inspiration because it gets boring to keep doing the same thing every year (for the chef anyway!).
I use a Chris Lilly pork rub recipe every year for some of the pork butts we do for the pig roast so I had already located both of the books you mentioned, but I hadn't bought them yet. Thanks for giving me the nudge I needed to hit the buy button on Amazon. You had me at brisket drippings!

I also found a sauce and rub book by Paul Kirk that looks to potentially fit the bill.
Always interested in new titles that help to take things to the next level, so hopefully future readers will continue to post to this thread and keep the book recommendations coming!
Thanks,
TJ