For woods I like to set the roughness by lerping 0.5-0.8 by the normal, so you get the illusion of contours and stuff in the grain, but I tried replacing that with a constant of 1.0 and still saw tons and tons of the shininess from that screenshot. The skylight is movable with shadows disabled (levels are generated at runtime, so there’s no getting around it 
).
What’s a reflection probe? I’m learning a lot of the PBR stuff on the fly, so it’s entirely possible I skipped an obvious step by lieu of not realizing I was supposed to do it. 