Viad,

Compare the formulas for ID-14 and ID-20.

The only difference is the additional 1.5 gms of Metol in the ID-20.

Both developers contain 12 gms of hydroquinone. That's what makes them high contrast developers.

My idea of a high contrast developer is one that produces very dark rich blacks, used on a paper that has a bright white base. Amidol would be my choice for a high contrast developer.