you are doing best possible to help those plant they need to be cooler then veg during flowering. you should try to find a fan ( Mrs.GJ throws a big hard book to whiskeys face and yells "Thats what ive been trying to do!" ) ouch..
do you use co2? i have a little bottle with water sugar and yiest in there i read it somewhere you can also put baking soda and vinegar its cheap ways of co2 im also going to foliar feed them in about 1.5 weeks with guano and stuff. you could buy some guano and put it in with ur water. i heard if its used a week before flowering - a week into flowering it gives off huge results. hope those girls start showing soon