Thanks all, appreciate the welcome and the comments. I did wonder whether cutting them cross-grain might have exacerbated the shrinkage problem. The beech one has moved a lot and is certainly cross grain. I thought he wood was dry....it's a good 5 years old and has been in the workshop for several months.
I suspect the roundness problem is going to be....problematic. I have a graduate short-bed....the tailstock is not really designed to be super-accurate and the slightest bit of woody-swarf underneath can knock it out quite a bit.....but that's probably just an excuse 
Will be turning some more over the weekend so may be able to show the next batch soon.....