Hey man! I got a similar setup. They didnt have the 2x4 tent so finally bought two 3x3. Also living soil but round containers.
I think your plants would benefit from a little bit less light intensity. Those purple stems and the look of the leaves. They look like my plants when I set the new light and now after I lowered the intensity they look greener and they gain more weight in the end.
I didnt read the whole thread and I dont know you. You probably a better grower than me I dont mean to school anybody just talking about my own little experience.
Keep it up. Your final product looks great tho Ive been scrolling