Geof, wow you have some beauties! I hope you do this next year. This coming season I'm going to be maxed out for space, I placed a large Swan Island order from a gift certificate. But the plan is to remove another large section of lawn next summer, fingers crossed.
I had to chuckle about the dusting with cinnamon. Last year as I brought out my tubers one variety started to get some mildew. I did not have any commercial antifungul. I instinctively grabbed cinnamon and gave them a good dusting. Worked like a charm.