Before any hard decisions are made I would get your soil tested to get a good understanding of the potential of your specific site. Double A is a great resource but their recommendations are based on their best experiences. Your site, soil, micro climate training and a host of other conditions can affect your specific vigor. I have two sites a half mile apart and they are completely different in the soil composition and in resulting vigor. If you know any one around you who is growing any vines pick their brains if you can! Good luck!