Jim's book The Essence of Jazz Drumming is a distillation of his teaching method, and it's a really excellent source for anyone looking for a way to get deeper into time and jazz drumming. One of the keystones of the book and his method is focusing on articulation in the ride cymbal - thinking about the musical line in the RH, and having "extensions" flow from that line, in the LH, BD, HH etc.
A hallmark of Jim's teaching is stressing practice at very slow tempo - for these Basic Time exercises, practicing at quarter note = 40bpm - 60bpm, which is so beneficial to internalizing that articulation, and really embodying the time. I've found that practicing most of the material in this book in this way to be almost meditative, and the benefits have been far reaching.
I highly recommend checking out the Essence of Jazz Drumming, and Jim's other iconic publications - Syncopated Rolls, and Rhythmical Explorations. They are the kinds of books that will give you a lifetime of material to explore.