I have a Vortex Viper PST 6-24 Mil/Mil FFP when get about 20x + the images get darker and eye box gets tight. I understand this is a characteristic of this scope but the question I have is are the Razor HD more forgiving (eye box/eye relief) and brighter at mag magnification? I like to use the whole scope and not just sections. My PST I take hunting and also tank to shoot matches.