Try to anticipate where the highly figured target wood will be, stay away from the pith when milling.
Dry the pieces in a moist, damp place, if you have one. I have a very damp, dark, condensing, gravel floored barn that I use for these types of pieces. High humidity helps reduce drying rate.
I would apply some Anchorseal on the face of the crotch area as well as the ends. Short pieces will really try to dry too fast. Anchorseal is your friend.
Sometimes, crotch wood just cracks.