I have a 2 year old seedless concord grape vine and don't know how many buds to leave on it.

I pruned it in very early spring before the buds broke, and now it has a ton of new growth starting and I don't know how much to leave.

I've heard you need to base it off of the weight of the vine you pruned (30 buds for first pound, and 10 for every additional pound), but I only pruned a small amount as I got the plant late last summer and it was small.

There was one grape bunch last year and I am hoping to get more this year, but obviously, I shouldn't leave every single bud on the vine. How many buds should I leave on it?

It's in a huge pot with a tall trellis in it and the main vine is approx. 5 feet tall with a few smaller vines coming off of it. All of these are covered in what I think are buds and new green leafy growth.

Thanks.