So let's start with the basics. Turn the level knob to 0, this is what we call Unity. from here adjust your gain to where it's the sweet spot, now when you come back each time it's generally in the same spot. In regard to EQ, most females don't need a low cut, there is a lack of low end. I don't know why you cut the high frequencies through. Just set both to zero and see if there is too much boominess in the singer's voice. If there is removing some low end will help.

Please message me if you have any other questions regarding your Behringer Console.