Mahirap i compute kasi walang data yung mga materyales na inilagay mo. Pero, if you think it sounds good and right, ok na. This is what you do. Get a CD that you like listening to and are familiar with. Try to notice the nuances of the mix of a song, i. e., hi freq - cymbals, crash and ride; low frequency like bass, mid low like kick, voice for mid high and others. Try to see if there is balance in your room, or if certain elements in the song seems to jump out. If you think, the sound seem to be balanced and is not at all harsh, the room is ok. Or if there are any problem frequencies, keep notice of these frequencies and you either boost or cut them in your room, to compensate for what is lacking or over. A good room is a room that you are very familiar with, and that you know the anomalies of the room and compensate them in your mix.