I’d say that color on the new leaves isn’t too concerning yet. The old leaf margins look fine. When you are watering, are you getting a good run-off? And are you measuring the ppm of the run-off? You may want to measure this as you could have some salt build up in the soil causing the issue. Water until the run-off PPM is within 100 or 200 of the input water and then water with some nutrients. Give the soil 4 - 5 days to dry out nicely and things should return to normal