I would get neem oil. I just got rid of (knock on wood and fingers crossed) a little pest infestation myself and it worked quite well for me. I have been both feeding it and spraying it on the plant, taking no chances. I like that you can do that with neem oil, keep some in the plants vascular system to keep pests and funguses away.
Cant wait for the pics!
I hope no one yells at ya about the fan leaves, cause after flowerin with LEDs, I can see your train of thought and it'll be interesting to see how much, or if, it does help, ect.
About topping the plant, I dunno bout that. I would definately bend instead of top at this point in flowering. To top now would be to throw away good bufd ya know? 14 days in I often have to bend mine, and I always get an incredible harvest both in quantity and quality off of plants I bend. I guess in your case the biggest problem wiould be the shadow created by the bending...