I think a dual pay chart option is the best and most realistic for planning purposes.

Very, very few airline pilots only make min monthly guarantee and not a penny more, for an entire year. Let alone year after year. Its almost impossible, and when it does happen (for a year or more) its almost always by choice. The 1000 pay hours a year WAG is fairly accurate in more cases than its not. Usually far more accurate than min guar only.