6th week flower in led, ok so far?

Hi people, ive done crops before with hps, but this is my first using led. Using a 900w blackstar uv led light, canna coco medium, canna coco a and b, pk 13/14 and also cannaboost. Think im getting good results, but not totally sure if i should go ahead and add a 250w cfl too, or if the grow is doing as good as its supposed to for the time etc.
Im growing 2 grand daddy purple (blimburn seeds), 1 chemdog 4 (blimburn seeds) and 1 critical kush (barneys farm).
Im almost on day 36 flowering now.
My questions are please,
Does this grow look ok for just starting 6th week?
Im a bit confused with the pk 13/14, i used it in week 5, critical kush has really swelled up, but i think i should keep applying it to gdp and chemdog 4, but not critical kush, as gdp and chemdog are 9 weekers and this week would be 3 weeks from harvest for them, should i apply it to those for this week too?
Also with gdp, its supposed to be an indica, yet on one ive got what looks like pure sativa leaves all over the plant, think only 1 indica leaf the rest sativa type, can gdp have a sativa pheno?
Thankyou

Also, will the purple come out more with the led? Temps are about 27c with lights on, 22 lights off

the plant is bred for the purple, but to help it along you can make it colder during the dark period. cold=purple. i'd say to keep feeding them the pk. i usually stop at 56 days, then flush with ph'd water.

Thanks, the room is cold at night with autumn here now, and passive intake flaps should help a bit. Sounds daft, but is there a noticeable difference between using pk for 1 week, and using it for few weeks? Was tempted to do that, mainly so i feel im making a difference to the pk bottle too haha, just was going off back of bottles instructions to be on safe side. Prob not a good idea im thinking to give it to critical kush, looks like itl def be ready in 3 weeks, but if its ok to use upto week 7 i might use it for gdp and chemdog 4