I think the metal area is looking a lot better now. The wood area could use some love I think tho. Right now the wood is reading as very soft and wet. I think its coming out too saturated and dark in general. Some more edge highlighting in the gloss might help as well, although I'm just learning the pbr system now myself…
I think it is really important to remember that the reflectance is just determining the reflective properties of the material. You shouldn't be using it control cavities and AO. Your cavity and AO maps will tone down the spec just fine if you let them. Reflectance should be a flat color unless there is some sort of change…