I recommend against spraying neem oil on plants that are in flower, particularly as much as those, it pretty much ruins the smoke, at least that was my experience
I would look into other products, sorry I can't help you with specifics, good luck
Edit: Actually you might use it on those plants now, but I wouldn't use it past the first month of 12/12 personally,
I found neen gave my buds a funny appearance and the smoke was dreadful, went right into the hash bin