Discoloration bud leaves

Hey man. I think u need to flush the soil first and check the PH. This can be a reaction to the overfeeding with Green Sensation and PK 13 14. So overfeeding or PH out of range I think. It won't be mold cause u say the plant has a good airflow and that's the major killer for mold 😉 a bit higher humidity alone won't be enough then to start mold. Just one good flush and a week no nutrients won't do any harm and that will solve it imo Greetings