At 170 lbs and fairly tall, you should be fine. If you are physically fit and can hike hard that helps! What you lack in body weight you can make up in leverage. On windy days, you'll have to "vang sheet' so you're not overpowered upwind. Lots of info on that technique on line. There's also the ILCA 6 rig. Some people around your weight switch to that rig on really windy days. It's all about practicing in different conditions and building your skills in the boat.