It sounds to me like a mixture of improper skin stretching and lather that isn't up to snuff. Sometimes it's hard to gauge when the lather is just right, so, what I like to do is use the crook of my thumb and forefinger to squeeze everything out of my brush (over my lather bowl). If the lather slides off in a goopy mess, there's probably too much water. If the lather stays put on my hand, it more than likely needs more water. It's also a good way to even out the water and soap that's in your brush, evening out your lather. Remember to make sure your beard is wet before lathering.

Which area specifically is causing your blade to get hung up on?