That's a real nice canopy. I've no idea why you'd want a net on in a 3x3 with 4 dif strains @ZG420G,?.
40% set in mid veg is great to see such great results. It is a 3x3 right? So, you really would benefit from co2 enrichment. You know there's a few kits with just a bottle, reducer and solenoid valve. 70-80$. You have perfect setup for co2 enrichment. Either way, your high ppfd will give cracking results. Really nice diary & pics. Plants look great.