i dont know how much longer they need to go but if its at least 3 - 4 weeks i might give a small does of nitrogen and next time around like other dude sed i would feed grow juice for 2 - 3 weeks then switch to bloom. i have never did autos as i dont beleave in them but it be cool to try 1. Everything i've read said to use grow then bloom. an last week or 2 pure water. also u can make sure ur water is at a ph of around 6.5 this could solve ur problem if ur ph is off it will throw off your nute intake which could acount for the lack of it.
So after that came to mind i suggest getiing a ph tester i prefer the h2o type. test h20 adjust to 6.5 if needed. an to check the ph of your soil after u water ur plants u can check the run off to see where the levels are. if they are lower then where u set water u would need adjust ph a lil higher next water and so on.
Stick with the same strain until u perfect it. autos life cycles are so fast that u really need to grow out as many times possible to perfect ur process.
ur doing good, keep it up o an last pix u put up for sum reason they only show the russian