[Solved] Adjusting Countertop Reflectiveness

It is the specular that controls shine, yes. It's best, in my opinion, to use a DDS file when making a specular. It's just easier to make. If you open the specular in Photoshop and take a look at each individual channel, you'll see that it's all greyscale. No colors. The rule is that the lighter the grey the more intense the effect (with white the highest intensity) and the darker the grey the weaker the effect (with black essentially turning off the shine).

Each channel controls something different.

Red channel controls the blur/sharpness of the cube map
Green channel controls the intensity of the cube map
Blue channel controls the blur/sharpness of sun/moon reflection
Alpha channel controls the intensity of sun/moon reflection

The blue and the alpha channels control the shine you see when your object is outdoors while, if I understand correctly, the red and green channels affect the shine for items when they're indoors. It's the red and/or green channels you'll want to edit.

This is what the red channel does:



This is what the green channel does:



If you want to tone down the effect of either channel, darken the grey in that channel. Remember that full black will turn that channel off. The problem is, there seems to be two specular maps and I assume one is for the countertop while the others is for the counter base. Not sure. I'd have to look at the original counter that was cloned. 

Edit: So, the original counter has two diffuses, two bump maps and two specular maps. The trick is going to be figuring out which of the textures is the specular.