If your local shop stocks tongues, you can take your boots in and try them on. It's a really easy process to switch them out. The next stiffness level would be a 6, then 8. I'm 165 lbs and just switched to an 8 tongue. Been skiing a #6 for 3 years and the 8 feels fine for me. Just don't get a tongue that you can't flex, that will suck. A lot.