This might simply involve thinking more about their comfort, or letting them know more about what's going on. Think carefully about what you tell passengers, and what you don't tell them. While it is important to ensure your passengers are well briefed, it is not necessary to discuss why you might need to exit the aircraft - just how to do it. You're sitting near to Centre of Gravity - so you don't move much. Your passengers down the back will move a lot further and will therefore feel every little twitch of the control column.
Turbulence is always a distressing part of the flight for passengers.
You'll often find a lot smoother air by climbing - sometimes as little as 500 feet can make a big difference. Please consult the relevant technical documentation for full information.