So this year I started over trying to establish my trunks (planted last year). Some of my vines are only putting up 1 new cane while others are starting 4 or more. I'm trying to train 2 trunks per vine. For the ones with more than 2, should I pick the two best ones then prune off all the others so that the vine puts all its energy into the two I want? Effectively treating the others like you'd treat "suckers".