Whats my issue, light burn, nute burn or what?? Need advice

What I think has happened here is your feeding was a bit on the strong side and the tips of the leaves got a tiny bit of nute burn and then stopping feeding has been too drastic of a reaction and now the plants are lacking Nitrogen, Calcium and probably a few other things. If you see tiny nute burn on the tips like that, just dial your feed down slightly or spread what you would feed in 1 watering over 2. In flower your plant is bulking a lot and they get a lot more hungry. Don't add a huge dose of food all in one go to try solve the problem, go slow and feed around what you were before or a little less and you should be fine.