Deathadder gives me pain the the joint between pinky and ring finger.
How come nobody else has the same issue? Due to its shape my ring finger rest upon the littlefinger.
All other mice who have similar shape give me same pain.
Where are you resting your fingers?
One mouse is not going to work for everyone, I personally use the M65 because it fits my hand better (and my deathadder developed the double click issue)
Deathadder gives me pain the the joint between pinky and ring finger.
How come nobody else has the same issue? Due to its shape my ring finger rest upon the littlefinger.
All other mice who have similar shape give me same pain.
That's an issue with your grip style. The only solution is replacement with something better for your grip, or learning to grip a different way. Go to a local store and try out a few mice, especially the RAT and G502, those might be a bit better