Fruit woods, ocean spray, hawthorn are woods that are difficult to dry....But I have discovered that by submerging the wood in water for up to a month decreases the cracking of the wood considerably. Native americans use to put their staves in creeks for a length of time to remove "saps" if I remember right. I do not believe that this is true, as saps are not water soluble if they are a true sap.
What I believe truly happens is that inner heart wood is dryer than wood closer to the sap, therefore there is a dramatic curve in the drying from internal wood compared to wood closer to the cambium layer (where moisture is transfered to the tree or shrub) By submerging the wood in water till it is totally saturated the drying process is then equilized, and therefore less cracking accurs.
I also have a wood turner that has imformed me that to decrease cracking in wood boil it,(whole stave) I know this is not practical for most people, but would be a interesting experiment.
Brian