Um, for what its worth. If I feel Im getting a little rusty with my hand to hand flow, I blaze though the back section (Advanced Rythmic Studies) of the Buddy Rich book. Sometimes to click, or just swinging away on my own wave. Otherwise I regularly work out of Master Technique Builders for Snare Drum by Anthony J. Cirone.
I'm not familiar with Cirone. You say you're having problems with "hand to hand flow" if you can be more specific about just what the problem is, maybe someone can offer some helpful advice. I'm not quite sure what you mean.
John