It should not make any difference what type of film you are using. My F100's are used for slide, colour neg and B&W. I don't have a problem with any of them except with flash they tend to over expose all mediums. Could it be that you are not developing the films for long enough? I have always suffered from excess contrast when I come to printing stage so always half the film speed and chop the development time, that way I get 'meaty' negs that print quite easily. I don't think it is your metering. Of course you could always use the spot meter. Meter off a mid tone shade (grass) and hold that so when you move the camera back to the chosen view point the exposure will be what you want.