The damage to the edges of the leaves looks to me like nutrient burn or advanced heat stress, and the tops of your plant being light green is normal for new growth. If your feeding your plant stop for a week or two and give it just water. Also they look heat stressed (leaf curling), give them some shade for the middle part of hot days. If it's above 90, give them some shade until it cools off. No need to worry that there not getting 100% sun all day, if there too hot then they are spending all there energy trying to stay cool, and not growing anyway.