First indoor automatic grow

You should keep giving them your veg stage nutes routine until they finish their stretch. Then start to increase your bloom nutes to ensure they receive less nitrogen and more phosphorus and potassium which will help bud growth and density. You should also have/add some cal/mag on hand as during budding plants can deplete them quickly. In the mean time you can tuck or remove any large leaves blocking light to stems and bud sites. This is also a great time time to re position your branches to provide as much light & room for the buds. After she's done stretching you can remove tiny buds sites from the lower parts of the branches to direct more energy to create larger upper buds. Hope this helps

They look good. What you thought was burn looks like a phosphorus deficiency in that one leave. Since your adding it to your nutrients you should be good. It's not unusual for the oldest fan leaves to have nutes drained from them. It's a perfect time to defoliate. You can remove the leaves and tiny buds from the lower 1/3 of the plant. Your nutrients look good just keep a look out for signs of stress like the leaves hooking, curling under at the tips or yellowing/browning tips. Your buds should be putting on some size over the next few weeks. Good luck

I would def consider flushing for 2 weeks if it was me. With bottled nutes you get a lot of salt build up from synthetic nutes. I did an experiment with just soil and bottled nutes, and just “did a grow” with it with a plant and when I get the soil out of the pots it was just soil white and crystallized to the point it didn’t look like soil. I used GH trio. I’ve also seen this in a buddy’s grow where the smart pots on the outside were solid white on black pots and he was using “organic” bottled nutes. It wasn’t fit to smoke in my eyes. I read somewhere that when you start flushing break a tip of the leaf off and just taste the juice in the leaf if it taste bitter and nasty needs more flushing. I know the GH says to flush after every third feeding. Personally I would take the 2 weeks to flush what ever you decide good luck with your harvest and happy growing!