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I agree, your plant looks fine, the buds are showing red hairs, which means you are 3~4 weeks away from harvest.
At this stage it is normal for the plant to start using up some of the energy stored in it's lower fan leaves to feed the flowers.
The yellow burnt leaf tips indicate that you may be over-feeding slightly, but it is not serious.
I would gradually reduce the amount of nutes you are giving the plant in the next few weeks, and do a flush two weeks before you plan to harvest. That way you get a smoother smoke..
You are growing them in 7L pots, which limits the size of the plant and as a result the size of the buds.
In the next 2~3 weeks, most of the bigger fan leaves will turn yellow and fall off, your buds will also get bigger and fatter.
By harvest time, your plant should be mostly ripe cola with a few yellow fan leaves sticking out.
Just let the plant do it's thing and don't cut the yellow leaves off, it will take the nutrients in the leaves and give them to the flowers. The leaves will turn brown and fall off when you pull on them lightly..
This way you let the plant re-cycle the nutes it has already taken up and manicuring the harvested buds will be much easier because you don't have to trim all the leaves that are left over..