You can get 15 more green packs if you click on a player and form there click to increase his condition. You will get 2 options.

1) To increase condition by the condition pack your have in storage.

2) Increase condition by watching a video.

But you can only get a total of 40 videos daily. With this trick you can farm 40 green boosters.

I prefer to stop when my attacking white skills reach 140 percent. But it depends upon individual preference.