Hey brother, wpm is systemic, and that means it will keep living in the plants system even while you killing it on the leaves, so you'll be in a run with it till harvest, and who gets there first situation.
You look far enough along on half the plants anyway and now just keep spraying as you have and dont stop and let it form again on the leaves to spread further. That's the best you can do in my opinion and then wash the bud with the wash system and buckets, you'll be okay.
The others just flowering, you could use AQSF or Neem, or even pH water, and some use Milk, not the full cream please, for your own benefit haha.
Late in flower, never use Neem and most the time, nothing but pH water, milk or h2o2 last 3 to 4 weeks of flowering.