In the gain structure process of my mic with the mixer, I was always taught to back off the gain a little bit before it peaks. But if I do that, it seems I cannot reach very high volumes of my voice in the room (I'm a singer), because I can easily get audio feedback after a certain point. What I do instead is to back up the gain a lot more and in this way I have to keep the fader very high to balance it (with the risk of distortion). But at least, I don't get the audio feedback issue, and I can increase more my voice and backing track volume with the master fader, and enjoy the music in my studio even more.
Could someone tell me if I'm doing something wrong or not and what I can do to fix the problem that doesn't allow me to do a correct gain structure?