What else do I need

[MCD500]

I have a 4x2x5 grow tent a 600w LED I have one grow not to bad of results. I grew 3 plants from clones purchased locally. I want to increase my yield and quality. Once I switched is when I had concerns I think I over did it with nutrients yellow leaves and stuff. I stop using nutrients the last 4-5 weeks never went back to them. I think that this affected my yield and quality. I am about to start another grow soon from seeds. Some photos attached. The strains were Chemdawg 4, Sour Patch Kids and Sour Tangie Just thinking out loud before I get started Will start seeds soon.
I got a lot of help from here THANK YOU ALL!

 

[D.A.A.S.69]

They still don't look that bad to me,
Next grow stick with Nebulas feed schedule, all the way to harvest .
The last 3-4 weeks is when the buds really swell up.
GoodLuck
HappyGrowing.