Hey man unfortunately you're running out of space which means your tops is like getten too close to the light. It's hotter and a bit drier up there (check your temp at various heights ! ) , and leads to all sorts of problems like your main cola dryen up or dyen. You'll want to be brave and HST to control for height. Adjust and a nice distance, bend but don't snap, rest it so the weight has plenty of room to grow. If you do it right you're gonna get loads of yield. Be best. 🚀