Anyone experienced with Nirvana White Widow or Blackjack?

At the end of week 14 of flowering there are no cloudy trichomes, no amber trichomes or the like on the strains mentioned (Nirvana WW & Nirvana Blackjack).

The plants don't seem to have grown much, if at all, over the last 2 or so weeks. They have a great diet, they seem healthy (though the leaves on the upper buds are dying off), they're using water pretty consistantly, the temp is kept at about 78 degrees and the humidity at about 50 percent.

They are in FFOF, FF nutes all the way.

Does anyone know if these strains from Nirvana should take this much time, or did I miss the boat somewhere along the way (missed the harvest window)?

Any thoughts would be appreciated.

I've never been impressed with their White Widow, at all, it has no flavor and the buzz is pretty flat. The Blackjack on the other hand is a nice strain, but the flowering time is nine weeks. In my opinion, trichomes are not the best way to gauge harvest time, as some strains just never turn amber. I go by calyx swell, and the pistils receding into the calyx, as well as the general look of the plant. I've never had to take it past nine weeks.