DrJynx86answered grow question 4 years ago I say keep on the great care, they still need another 4 weeks flowering, they will get fatter in the next one or two weeks.
Trichome growth is proven to be related to colder temperatures, if you can keep them down, even giving short burst of very wintery cold, they will grow.
As always, this have the counter result of slightly smaller buds, so more trichs on smaller buds.
Also try with a Candy or Bloom Bust feed, there are a lot on the market and they're specific for bud and trichome fattening.
Happy smokes!