are you following the instructions on the bottle cos for flowering you should be using more gro them micro and bloom for the first 2 weeks it's a 321 ratio and then the opposite into week 3 where bloom is more than gro the only thing to stay the same is micro,
You will get there, when you get sorted with your next grow try reading up on scrog that's a great way to keep your canopy nice and even and allowing the light to get all parts of the plant
All I can see is brown pistals I would give it another 10 days and have another look, have you grown this strain before??? Most seeds come with a 9 week flower time but some don't include the 2 week transition from veg to flower making them a 11 week strain
You definitely have a nute burn flush them with plain water for 48 hours then adjust the ec to 0.5 and ph at 5.5 this should sort the rest out but the damage is already done on those few leaves they will probably fall off in a week or so
I wouldn't botherer with only 10 days left you will do more harm spraying stuff around your delicate buds at this stage, just get some fly paper and put it around your plant that will catch the little buggers
There looking fine for just over 3 weeks the only thing I can say is keep your spirits up when when your growing from seed the plant puts most of its energy and growth into its root system at least for the first 4 to 5 weeks anyway and then it should take off like a rocket be patient it will all...