Swap to BT-k and you don't have to worry about neem anymore. Safe, tasteless, useable through flower. (Bacillus thuringiensis - kurstaki)
Are you using Tap Water from the hose? High PPM tap water can cause your leaves to dry out if your chlorine/chloramine content is up there (I deal with this in my area), you'll grey at the edges and fry. Some strains more than others, made worse if you have other issues like deficiencies etc.
Fill a trash can and dechlorinate before watering! - if this issue is from your tap water or neem, problem solved :)