Good job transplanting into 5 gallon buckets. Those 1 gallon would not have been enough.

I just transplanted my 4 indoor ladies into 4 x 2.5 gallon buckets. Outside you will need much more root space !

Good looking grow btw... and I also use neem oil. Firstly I heat 1 litre of water until its warm, then I add 3ml of soap or detergent, then I shake up the spray bottle. This is important to get the soap to mix well with the water. Then I add 5ml of neem oil and shake very well to help the soap infuse the neem oil. then spray the shit out of the plants every couple of days for the entire life cycle of the insects. This will mess with their head and they will die off. You need to keep spraying to get the grubs that were laid too. 3 weeks is usually more than the life cycle of most pests.

Take care.