Sorry for making the wrong assumption and not writing more clearly. I wasn't sure how to reply with a foot in my mouth. So I wrote the following using technical bullets; it doesn't flow as well and it sounds like lecturing.
1) I'm not suggesting you need a wider board; that statement was used as a qualifier to explain why you are using a men's board.
2) Men's boards are stiffer than comparable women's boards; see Never Summer catalog and make comparison between men's and women's version of SL or Evo.
3) Follow Snowolf's advice.
4) In a couple of years, when you have either packed out your boots or out grown your boots; follow Wired's advice about a new boot purchase. I've known many people that bought the wrong boot, myself included. I am not suggesting you have the wrong size boot; rather that boot fit is critical in your situation. You need the smallest boot that will fit comfortably on your feet.
My apologies again Nito