Hey Finer things,
What part of your chin troubles your blade? Should it be the side of your chin, you may want to try a scything motion by sliding the point of the blade toward your nose as you stroke upward on you ATG pass. If the direct front of your chin is the difficulty, you **may** find that a little pressure may help by way of a buffing stroke. IME, the chin requires shorter strokes to be shaven effectively. Lastly, make sure that you use a good facial soap that lathers well in your prep and you should leave it your face for a few minutes, so your beard has a chance to soak it in and soften up.
Cheers and Good luck!
PS during the ATG pass try stretching your skin in front of the blade's edge.