First of all, when I dug up my tubers yesterday, I noticed that the new tubers often looked different than the original tuber looked/looks, in size and shape and length. In some cases, the original tuber was short and fat, but the new ones are long and narrow. Is that to be expected?

Also, when looking at the clusters, there are small, mid sized and larger tubers.... Are only the largest ones going to produce the best plants(in relation to the size of the other tubers of the same cluster), or are the medium and smaller ones good too? Or is it just the large and medium ones that are good, and the small ones should be thrown out eventually?

I know that I will have to determine which ones have eyes on the tips near the stem, but I'm wondering if tuber size is important too?