Linda,

"it seems like it formed a second bud
and I have two shoots kind of going in a V shape from the cordon. "

You didn't count the "basal" bud or the bud right at the intersection
of the spur and the cordon. BTW, there is nothing wrong with you choice
of pruning. There are a lot of growers in california who low cordon
prune their vines on a VSP trellis. It actually is a good system.

" It seems way too vigorous to me." You want the vines to look healthy.
I'm not sure how you can tell if the vine is too vigourous so soon. Are
the distances between nodes on the canes longer than 6 inches???? If
not the vine is probably not too vigourous. Don't sweat the water.
VINES NEED WATER. Only nearing harvest is when you might worry. Let
them grow. They know what to do best. As far as crop load if last year
was your first year I'd suggest keeping ~20 clusters per vine. I
wouldn't call your viners "mature" yet. Start from there and see how it
goes

Bob