Thanks guy's
Les,
I can do thinner stems, but not under such large cups. Practice more and remember the fibres in the wood are stronger than you'd think. Here's a practice for you. Put a 1" square by 8" (approx dims) between centres and using a skew, plane it down until it breaks, honest you'll be amazed how far you can go. You'll almost be down to a toothpick before it goes.
Woody,
I always appreciate your input. I made a set of golden ratio callipers a while back and forced myself to stick to what they said were the right proportions - looks like it worked.
Pete,
Hmmm? I did coat the inside (first time I've ever done it) because the bowls are only around 2mm thick. But I'm not 100% happy with it, so more experimentation. The outside is just done on a buffing system ending in carnubra wax.