Es300 Auto Train Wreck

Train wreck was burnt. I lowered ph to 6.0 and havent added any nutes to combat and it's still pretty yellow and has burnt tips near the top of the plant. Could this be from the light? Light is currently about 2 feet above the plant. The light is at 300 watts...not sure what to do here. Plant is still bulking and growing well. Trichomes are still clear for the most part but are starting to cloud a little. Cookies is growing nice and long with super sugary nodes. The other train wreck I didn't train so hard is producing some real long colas. Once the nodes fill in shes going to be a beaut. Northern lights is doing its thing as well. The plants like this environment besides whatever is happening to my #1 tw. Ideas or reccommendations to avoid any issues in the future would be helpful! Hope everyone enjoys my pictures. This is my first grow in like 5-6 years!