3Drag Velleman K8200 new y-axis rods - 10mm instead of 8mm

I have been working on my printer for some time and I think the 8mm rods on the y-axis are just too flexible. So I set out to change them to 10mm. This small change of 2mm to 10mm rod should double the stiffness. (Cubic function to the diameter). Now you all could claim that we have then more mass running around. Correct! There is an increase of 56.25% in mass of the rods, or to be more specific by 124g in total. In case you print on glass this is equivalent to 1mm thickness of your glass pane.