I used to use POG and put a wilson Pro overgrip on it. I can play for 4-5 hours without any problems in my palm. I recently used wilson ncode Six-one 95, also used wilson Pro overgrip. But after 2-3 hours' of play, I felt fatigue and slight pain. Maybe it's because the grip is softer than the leather and I tried to hold it too hard? I remember I had the same problem when I used wilson hyper hammer two years ago, which also has a synthetic grip. I am wondering if this is normal? Is it really because of the grip type? Does anyone else has similar experience? Thank you!