Sry superloud, heading out for a 5 hour drive to Detroit. Good luck with you exhaust issues. My last piece of advice is this - whatever you come up with try to minimize the changes to your existing setup. Sounds like things are currently working for you (except the smell) so try not to make alot of changes until this grow is done. You could end up shocking the girls for whatever reason and that is counterproductive. Its best to try and limit major changes to between grows instead of during grows.