UPDATE: I was using an old Gameboy charger from my childhood (cutting up childhood memories to power the growing of an illegal substance... /facepalm) and the fans were running really slow, so I went and took a 120V ---> 12V Super Nintendo power cord and hooked that up. Fans are now cleaned out and running like a dream! They are a little bit loud, a slight hum really, but I'll be able to deal with it. This grow case is supposed to be a server afterall, so I don't think that will be questioned.
Thanks for the help everyone, my heat is under control for now (I think...) and I will update once more with the actual numbers, for now have some old numbers.
Lights on - Cover off: 77F
Lights on - Cover on: 111F
Lights off - Cover off: 68F
Lights off - Cover on: 70F
Humidity varies, but it generally stays from 30-60% so it should be fine.