Overwatering or Nitrogen issue?

Nutrition is too strong. Autos are light feeders. Plus in coco ph in vegging in 5.8. Flowering 6.2. Anything above or below that range is lock out. Cal mag is needed in coco. Heavy irrigation is needed in coco. Testing run off is important as well. Coco is hydro in a potter. So as long as you don't run water through it none stop or let it sit in water you can't over water coco grows. Spots on plant are likely from ph related issues with it being too high in coco. I grow in coco daily non stop. What I grow best in. .1 ph in coco is a huge difference for plant. So maintaining the coco is key in coco grows. A huge plant is results when done right. Can dm me after selecting my answer if you have further questions. Happy growing 🌱