Looked at the leaves and did some research, either this is just a normal process where the plant tries to grow extra roots or it's mildew. Either way I think I'll dial down from 2 cups of water in the morning to just 1 once the soil has dried out today/tomorrow. Over/underwatering has possibly led to stem sagging + slow growth so next time I'm investing in Autopots or watering less often + small amounts...