Thanks for the comments guys. (Hello Derek, nice to see you here!)
I turned the bowl with the intention of letting it do its own thing.
I've moderated the movement slightly, by coating it in food safe oil as it dries, there are now lumps and bumps, as expected, but so far no splits. I'm sure there will be some eventually, but they will be considered a design opportunity
It already feels half the weight it was yesterday!
I'll let you know how it goes,
Neil