Hickory! My favorite. Never had any trouble with it checking on me either. Always wondered if that related to the tension strength, or if it suggests goo adherance between grain lines, or maybe it just doesnt shrink much as it dries.
Anyway, hickory begs to be heat treated. I find the performance goes way up with good heat treating on hickory.
Best of luck Eric! Thats alot of staves, you'll have alot of work ahead.