Brent,

Borrow someone's motorcycle and gently experiment with using just the rear brake and compare that to using the front and rear together.

I say gently because a mistake could put you and the bike on the pavement.

Stopping a motorcycle from speed with just the rear brake is possible, but it stops much faster if you use both.

Using just the front can be scary, but if you are careful, you'll get a very clear impression of just how much more of the braking is done with the front rather than the rear.