Shear stress size in tensor plot

Hi,

I just want to show the shear stress of specific elements in a tensor plot. For the sake of better visualisation I want these arrows to be bigger than the corresponding elements. 

I can create the tensor plot for shear stress in the XY plane without a problem. The problem is I can't seem to scale the shear stress since it seems to be limited to the element size. Even if I use tcl and the 'poITensorCtrl SetShearComponentScale ' command, I can only use values between 0 and 1. Is it possible to circumvent this problem?

Thanks in advance!