The picture with the damaged leaves show an issue with your pH. When the pH swings quickly out of range leaves will deform, twist and form random brown splotches. This will typically lead to lockout and other nutrient deficiency symptoms appearing. Check the run off next feeding to get an idea of where the pH is at and go from there.

Congrats on winning. That’s a serious upgrade.

20 watts isn’t going to grow anything but a tiny seedling for the first week or two. How much space are you trying to fill? 200-300 watts of any reputable LED brand would cover a 2×4 foot space to veg a few plants. You need about 400 watts to cover a 4×4 space.

Defoliation is not topping.

Roots pests attack and stress roots as quickly as anything. When you’re doing everything right but the plants are still dying has to be frustrating af. That’s always a possibility but when I read 40% perlite with Grow Dots I knew what was most likely the issue.