I'm really interested in where you're setting that light.
In one picture it looks like you've got the light all the way up top.
And the bottom when you have the light pretty much right on top of the plants.
Personally I have a barrier that blocks the light and I allow the plants to come up either through holes cut in a sheet of plastic stretched across. Or having a platform and Trey for the runoff because I usually do hydroponics.
Definitely do drop the light pretty close. Light intensity is one part however I'm not sure about the footprint of that led because I've never used it which is of course why I'm asking.
However I do have to give you extreme props on an extremely clean grow.