For that setting I would turn down the flood light on the Captain and FO.  That will get rid of the lighting on the main instrument panel.  Only turn on the PANEL lights for the back lighting.  For the EADI and EHSI on the EFIS control panel are the brightness controls for them.  The top brightness knob controls the EADI and the bottom knob controls the EHSI so you can dim those appropriately.  The EICAS dimmer is on the forward aisle stand.

Also, I think your DOME light is on a little bit creating that flood light effect, since that is pretty much what the DOME light is.

So if you want to darken your flight deck, turn down or off the flood on CA and FO side.  Turn off the DOME light, and turn down the EADI/EHSI/EICAS screens and it should get you to a level you're looking for.  *Note* it seems like the DOME light is only on/off, on my end there is no brightness level to it. 

Let me know if this hit anything or if it was a total miss again.