Dry, curled up smaller leaves

If you let the soil dry too much it could explain why apparently healthy leaves rollback and die. other than that i dont see more problems on the plant.

Nothing nutritional. It's poor light/airflow. Shouldn't be an issue unless it stays kinda moist too, then it can promote mold/rot. You might consider lollipoping your plants.

The dry, curled leaves at the bottom of your plant are likely due to a combination of factors including potential nutrient burn, watering issues, and light penetration. By adjusting your nutrient solution, ensuring consistent watering, and improving light exposure, you should see an improvement in your plant’s health. Keep a close eye on the plant and adjust care as needed. t's less common for nutrient burn to start exclusively with smaller leaves at the bottom, but it can happen if the plant is absorbing excess nutrients through the roots which then get distributed to the lower leaves first.

would guess not enough air, maybe food too strong or heat as add on.personally would not stress about few bottoms, it happens to all with dense canopy.