Last weekend I went out to cluster thin as recommended in From Vines
to Wine. I am in Southern California, have about 15 4-yr old Syrah
and Grenache vines on a hillside.

When I pruned this winter, I left 1-2 buds on each spur (not sure if I
have this term right) from each of last year's shoots. What has
happened on the ones with two buds is that both buds have sprouted
shoots, and sometimes each shoot has a cluster or two. Even on the
spurs where I left only one bud, it seems like it formed a second bud
and I have two shoots kind of going in a V shape from the cordon.

So I thinned the clusters as described, but somehow I am thinking I
have too much growth. Last year I got a middling first crop and am
looking forward this year to having a higher quality usable crop.
Should I remove one of the shoots at each of the spur positions? The
book seems to recommend pruning down to two buds, but if each spring
both of them sprout, are you supposed to cut off one of them? It
seems way too vigorous to me. I don't fertilize and water sparingly,
but we have had a lot of rain this winter, and continue to get weekly
sprinkles, so I think the vines are getting more water than they are
used to.

Is there a rough number of clusters that a mature vine should have on it?

Thanks!
Linda