They arent good climbers in my experience, at all. I’d lay the net down flat on the food, not vertically, with the food on top of it. The net/screen is only intended to keep the food from touching the poop.
Also your food is too wet and too much. It will likely mold quickly. Do smaller chunks. If you want to avoid them every day still do small chunks, but slightly larger small chunks

. Youll need to change food every 2-3 days at max to avoid overly dried out food or moldy food.
Its really not bad once you get your system down.