Mount it high enough Up.

My Headlight is at 32" off the ground , mounted a bit above the Hoop of the suspension Fork ..

I had a E6 in the picture, now I have an eDelux , which uses the same reflector design, beam pattern, [ B&M makes their IQ2 reflector for Schmidt. ]

WB Bicycle Gallery: Robert Clark's Koga Miyata WTR

I just barely have a hint shadow of the Tubus rack hoop in the bottom near side of the lit area , not significant. the rest of the lit area is un obstructed