If you have no treatment you shouldn't be mixing....wait.....let me say that again.....IF YOU HAVE NO TREATMENT YOU SHOULDN'T BE MIXING. Without treatment you are trying to make accurate decisions after hearing music thru a "room" filter. Tweaking your monitors, you are attempting to band-aid something that needs to be corrected the right way. Those high filters aren't meant to fix problems...some people prefer their speakers brighter than others. I'm guessing you aren't using a reference track either?
1/3 Environment (no treatment)
= your mix
Wait till you move and set up correctly or you will be re-mixing and re-mixing and eventually bang a hole in the wall with your forehead out of frustration. Guess how much money i would want back if you tried mixing my track without any treatment? All of it? I think so!