make mouse for people with large hands too!

My hand is so huge 20/12 cm... I have razer da, only because 20 another mice of all shapes i tried are even worse. I am holding mouse just with finger tips, which gave me repetitive strain injury... It is so uncomfortable, i had issues even before. My mouse cursor jumps when i click on 600 dpi and, i have to hold mouse different if i want to do specific move. Because it is like holding potato... WHy all mice are so small...