I've always been a coward when shooting chrome film for clients. I always proofed with Polaroid. They were all studio shots so I was able to gobo hot spots or fill in shadows. Spot meters are great in checking the range of your lighting. For detail in shadows, I make sure it doesn't fall below 2 stops of my F/stop setting and not above 2 stops of the same setting for highlights with detail. Neg film is much easier to shoot and you can get away with an "average" of your exposure.