Jakes 1st grow!!

It's a nutrient line up used by many growers without issues so it's good enough. Maybe you can add some extra secondaries with bud candy , carbo load or the others nutrients from Advenced nuts. After the 12/12 watch how your plants are evolving to see if they need something more or less

In the beginning of bloom your humidity can range from 45-50% you should lower it to 35% in the last few weeks of bloom. Ideal temperature would be 75 F but anything in the 68- 80 F would work. A 10-15 degree day night temp swing is also acceptable. If temperatures are too hot or cold it will slow down bud growth If temps are too high it can effect the smell,density and thc content of the buds. Hope this helps good luck

Flushing is a topic many growers argue about because studies have shown it doesn't reduce the nutrient content in the bud. Towards the end of flowering, plants eat significantly less, so a flush or large feed reduction won't starve the plant and inhbit THC and flower production. I would flush, but make sure you are actually in your final two weeks and this week start to reduce the feed to prep the plant for the flush. The flush is LESS important than keeping your plant healthy all the way through its' life. Nothing is worse then having to harvest a plant early and losing a lot of time and yield/ Good luck and happy growing!

Yeah it’s not normal for kush to flower for that long. If I’m not mistaken should be about 8 weeks. Your grow condition have a lot of influence on your flowering period. As an example my buddy uses chinese LED which has more of a higher spectrum output of let’s say 5000k whereas I flower using a full spectrum 3000k QB and he will harvest 2 weeks before me. If your plants experienced any kind of stress along the way its possible for the extended flowering time. Look at your trichomes and let them tell you.