Your plants under your light look good.
Your plants around the outer edge look over fed due to not receiving enough light therefore not needing as heavy strength nutes as the others. Notice the clawing of your upper leaves.
Your humidity WILL be a problem as your buds fatten and swell.
During flowering you shouldn't allow your RH to exceed 50% otherwise too much moisture will accumulate between the plants creating a breeding ground botritis or bud rot. Dehumidifier will help alot.
Research into micro climates and you'll understand what I'm talking about.
Other than that good looking grow.
Maybe next run try 6 plants or add another light to help the outer edges.
J