Hey Jebus,
I've never done a grow before, just been reading and planning for a 1st grow in about a month. So take anything I say with a spoon full of salt (a grain just isn't enough)

Your picture looks like your missing an air extraction system. Pretty sure your going to need to pipe out your old hot air a few times every 5 minutes. Maybe you could take the duct hose from the window and put it through the top of your tent with an inline fan for an air extraction system. It looks like the fan setup you have now will only push around the air and not cool it off in the way needed.

Good luck Bro!