Tropicana Cookies by newbie girl

I see your light is noted as 16inches above, but it's on 100%. Your light maybe too intense. I had a pretty similar issue early on. Looks a bit over water and "hot" on the light setting. Try dialing back to 60%- 80% or so. I'm running a few autos and had to dial back as one stunted temporarily(it was odd as heck at first), dialed it back to 70%, then ramped to 80%. My Banana Kush auto is about the same size and about to push pistols like yours. Good luck hope this helps. All corrected now. Happy leaves and nice green stems

Add more perlite in future grows. As for now you can't do a lot. If you are adding nutrition you need run off of 20 to 30 percent to keep from having a salt build up from prior feedings. You can Also prop potter up so air gets to the bottom of the potter. I do this in coco grows with a small metal rack. Have good air circulation in grow space as well. That is about all you can do I can think of.