Thanks for your responses. I did alternate the growth rings. I started with 30 BF rough, and after milling the wood ( 4 to 5 inch wide ) and selecting pieces I was forced to use two boards which were more like flatsawn, than quartersawn. These two pieces exhibit the most cupping.
The clamps and cauls helped to straighten the top, and none of my friends have noticed it is still slightly cupped.
If it was easy everyone would do it. Next time I check the moisture with a meter, and, add 10% to my BF estimate for the wood.