Leaf problem

Hello, So when i first glance i think tip burn...too much nutrients. But then when i look closer how some tips are yellowing further than just the tip and also some leaves are showing that bend like a taco or canoe..and I'm thinking light stress. With 2 1000 bulbs running at less than 20 inches i think that could be part of the problem. Can you see if the lower bottom leaves have the tip burn too? If not I'd definitely say lights and raise them several inches or however much you're able. It can always be helpful to recalibrate any ph pen if you're using one just to rule out fluctuations also. Happy flowering. ✌️