As usual Dierwolf produces excellent posts.
The only way I see to improve on this is by using square pots instead of round ones.
square 1x1 ----> 1
circle diameter 1 ----> r^2*pi = 0.5*0.5*3.14= 0.785
1/0.785 = 1.27388....
So a square is bigger by 27.4%