I had Zowie EC2-A and Logitech G403, lightweight and feel very good in your hand. Question of getting used to it. There is no universe in which any Deathadder mouse can be considered a better pick than those two in terms of... everything, including ergonomics. Just get a different mouse.
I'm currently using A4tech A90, it's been 5 years and it's still good. The shape is the same as the deathadder and it has metal bottom so it moves like butter on mousepad. It's insanely good for the price.