Too light a tracking force will be audible as gross distortion, particularly during loud passages. This distortion will tend to increase as the cartridge moves through the inner grooves towards the end of a record side. The distortion is caused by the inability of the stylus to stay in contact with the groove walls. I suspect too high a tracking force is inaudible. It's not good for the cartridge or the record -- it increases wear and tear on both. Remember, within the range specified by the manufacturer, there is typically a specific tracking force that sounds better. This point can change as the cartridge ages.
What are the affects of setting tracking too hi or low?
How does increasing or decreasing the tracking force affect the sound? OR Can you tell if tracking is set too high or too low by listening?