The first time I meant you had to connect the reflective shader to the surface-input of the wet rock stone shader and then connect the surfacing shaders like displacement to the reflective shader.
Seeing this picture I'd suggest adding the reflective shader as a child-layer to the wet fake stones shader.
You should do the same thing for the wet rock. Logically I'd connect one reflective shader into both childlayer ports.
Some suggestions for specular settings: I always find it easy to keep a ratio of 2 between highlight intensity and spread and to work from there. For example: intensity 0.2, spread 0.4
If you don't get it to work then please post the tgd. I don't know why, probably compression, but the image is barely readable again
Hope this helps.
Martin