Should I be hitting driver further?

I have a driver which I hit at around 160mph ball speed, and launch between 10-15 degrees. Not sure on the spin rate. However, I've seen YouTubers hitting my driver with the same ball speed, and similar-ish launch angles, but they carry the ball 30+ yards further than me. What's the likely cause? Shaft/spin? I have a stiff shaft that came with the driver.