I an recording a singer that sings very quietly. To get a good level I have to crank up the gain. I am getting lots of mouth noise and no amount of water or apple juice seem to fix the problem. I can remove most of the noise but it is time consumming. I have tried different mics, U87, akg 414, Cad, and am now using 421 with pop filter and wind screen. Still getting it. Moved the mic to all sorts of positions. Can't think of anything else to do. Any ideas ?????