Question about Shaving with the Feather AC

Evening gentlemen,

I picked up the feather ac and have fallen in love with it. I am getting decent shaves with it, except for directly under my chin.

I attack most of my face with the feather pretty much flat against my face and almost no pressure and it works well. When I do my chin I get a severe case of razor burn and lots of stubble.

Any tips?

Thanks.