@eyeofthebeholder As I've answered
here and
here, the most important factor to muscle growth as vegan is caloric intake, not macronutrient ratio. It's so especifically in our diet because it's richer in fiber and water, you can find more info on that on those answers.
Here, as a side note, I also point out how we shouldn't worry about health while bulking on a vegan diet as the biggest health impact will most likely always be the weight gain itself (even if it's muscle).
Now that the context is out of the way, if you're worried about health (which I infer from your first question), the percentage of daily protein intake should be as much as you can possibly get from whole foods (tofu/seitan/tempeh as you said, but other beans and cereal also work, you'll find some recommendations on the links above for sure). Now, if you really want to bulk efficiently (disregarding health, which is a must for that). You'll have to eat as many calories as you can, a minimum surplus to gain muscle mass at a pace of 2kg/month is around 400kcal daily. It's increased (but also fat gain, sadly) with higher intakes, regardless of protein intake.
I pointed in the threads which I linked about how most of the daily recommendations (ranging from 1,4-2,2g/kg of protein per day) were either performed on unrealistic diet conditions and decades ago or are tailored for professional athletes who train two times a day, six days a week. For the rest of us mortals, caloric intake is BY FAR the most important factor (as long as we remain whole-foods plant-based).