I must admit that I've cut way back on my veggie intake due to not finding much data on previous HG societies relying on them much at all along with some other data. I am low carb still, but now when I eat anything other than meat, eggs, fish, milk...ect. I make it a sweet potato or some fruit. Heck if I eat 2-3 servings of fruit or sweet potato a day I would still fall under the 100g carb mark. I still use veggies for taste and texture, but I don't attempt to pound down several kilos a day to hit some magic number (5-11 servings or such).
All in all if your gonna go high carb, or just high plant surely the sweet potato is the best way to do it (least it seems).