I’m currently fighting the same battle with those little pests…only found a few so far though and some eggs…I think.
I have not tried the DE as of yet, but I’m trying a homemade neem oil spray (neem oil+dawn+water).
I mix it all up and spray undersides of the leaves and little on top just before lights out, every 2 days or so for the past week and so far I have yet to see anymore adults or eggs, but this is the second round of my battle and the first I only did a couple applications and they came back, so this time I’m going to try 1 full life cycle and a bit.
I have also been spraying the room, floor and box (tent) from top to bottom.
I will watch the thread on your progress and good luck on your battle…kill those little sh!tz…lol