So I just dug this up on reddit while stuck on the ship and I thought it best to spread the good word of crtl+home!

Go to your HUD layout, select the bit you want resized, and hit crtl+home. As of now, there are only 3 sizes to choose from, but it's a damn sight better than nothing.

Enjoy your newly found screen space.

Also I will be doing a UI theory and tutorial write-up in the next few days. It will cater to the Logitech g-600 (and mice of the like) but I will address how the same basically principles can be applied to any keyboard. Along with that will be some insight on the placement of some of your other HUD elements, catered to healing, but I will go over how the same concepts can be applied to tanks and drummers (err. . . Dps'ers)

~Jack