I've not got that book, but I've seen it recommended as one of the good ones. I do have Stick Control, but have not really worked through it. I know Drumeo have some lessons based on it, so I should look at those.
I just tried playing through your exercise and it's making me concentrate.
!PIZZA
Syncopation is the book. I think it was written in 1929 only for snare drum. You can apply to rock pop latin jazz etc..........You should check some interpretations on the syncopation vids on youtube.
. This video is good for your left hand