Hi,
Here is a picture of the 3 Epic rudders:
Surf (Larger elliptical rudder)
Universal (Middle), and
Weedless (smallest)
The shaft to leading edge measurements are 30, 35, 30 respectively.
So if you position the weed guard now, with the Universal rudder in place, the gap between the trailing edge of the weed guard and the leading edge of the surf (when you install it) will be 5mm greater than it is now with the Universal.
So get it in close with the Universal.