I'm currently using a logitech g100s with a fingertip grip. My wrist becomes sore and sometimes painful after playing for an hour or so. I've only had this mouse for a week so I am trying to change my posture, grip, or even the mouse to prevent further damage.

Is it possible to use this style of grip without wrist / arm pain?

I use a medium sensitivity (18 cm/360 no accel), my wrist does not touch the mouse, and my forearm does not touch the mousepad. I have noticed that I squeeze the mouse when trying to track or flick. I believe I am tensing my hand too much when I play. Could this be causing the pain?