What rootstock?Well, that makes a difference. I don't have the sun issue, but without the tubes, my first year vines this year reached the top wire and I was able to get a nice head with a couple of cordons. Now they are growing canes like nobody's business. I may let them bear next year on year 2, which I haven't ever done. But I think I've got the soil prep down fairly well, which resulted in some vigorous first year vines.
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I have a lot of different rootstocks planted in my vineyard
Malbec-5BB Kober
Alicante Bouschet- 101-14 3x replants on 1103p
Merlot-1103p
Cabernet Franc-1103p
Barbera-101-14
Carmenere-Riparia
Picardan-S04
Picpoul-so4
Nebbiolo-1103p
I want to grab petit verdot to make my Bordeaux vineyard whole.