The bat need more details in the wood to metal plate transistions. It could be made in the diffuse using darker lines around the plates. Also use a less uniform specular on the metal and more distinctive scratches might help read better. Dont over-estimate the normal map, the diffuse often need its quantity of details to…
Stuff looks great, man. For the bat, while I have never really done a spec map before, maybe you could try darkening the bat a bit in the spec and leave the metal as is. If that doesn't work maybe try making the metal a bit brighter in the diffuse. For the parking machine did you make a high poly? Just curious...