As far as the exposure goes, for albumen I usually want the print to look about two stops overexposed when I take it out of the frame. I'm not sure if you need that much for Kodak Studio Proof, but it's probably somewhere between one and two stops.
Try it for landscapes or other contrasty scenes like indoor/outdoor shots. POP is self-masking, so once the foreground comes in, you can continue to expose the print for more highlight detail, but you won't lose the shadows.