I have asupport ticket here:
I actually think you are onto something with the fan.
IT was a static directional fan, and was basically blowing right at that plant that is curling the most.
I just moved it up (like right befroe my post earlier) where it is not directly blowing at any one plant, but rather circulating air above them (and will get a oscillating fan soon).
I had used a some diagnostic site on growweedeasy, and it looked to be the fan issue.
So, maybe that will help out.
I’m not thinking its the vpd issue, I used an online calculator as someone mentioned earlier and am pretty well inline.
I’ll check again all the readings to be sure.
Only one I was guestimating on was leaf temp. I may grab myself a laser thermometer so I can nail that down.
Thanks for your support.