Hey Jason I'm in zone 9 in Sonoma County - where are you? This is a tree forum; you won't find a lot of grape experts here. You would be better served by checking in with your local UC extension/master gardener office. Or looking around for other grape growers resources. Goodness knows there is no dearth of them here....

Looks like several cuttings bunched together, are all the leaves doing this or just the lower- and inner-most ones, that are beneath most of the foliage?

Mostly all the leaves, including the new leaves from recent shoots.

might have better luck in the fruit and orchard forum ... ken