I agree the mask color and value being used to give the illusion of the thick armored glass is too dark. Your picture from the P38 handbook is deceptive. The angle of the picture was taken from is tilted to pick up in detail the N-3 gunsight behind the thick glass.
Here is a P38G cockpit photo more from level. Quite a bit of reflection causing a masking affect opposed to your photo where the camera was closer to 90 degrees to the armored glass to allow the image behind the glass to come through.
As for the relationship of the pilot's head\eyes to the pad on the top of the armored glass. You guys can argue that from the P38G WW2 photo below.