Hi Tintin
I think that you might be using a profile that I was using prior to the release of Luthiers code, I have since removed it, and am using Luthier's Code now, you will need to follow the new instructions for the new code in the link that I have posted here at the bottom of this post.
What I do is this: -
(1) Make sure that you have activated Sli in the Nvidia control panel and don't have one of your cards selected as "Physics" (in this panel I have selected "cpu" not "auto select")
(2) Run Nvidia inspector, activate "Il2: Cliffs of Dover" in Nvidia Inspector by selecting it and clicking on "Apply Changes". Do this before starting C.o.D.
(3) I also run EVGA Precision which shows how my cards are running (fps, temps on both cards, percentage of use both cards, etc.)
You don't need to point anything to "Launcher" it will be found automatically.
I suppose both your cards are the same model with the same V/ram (they won't work in Sli unless they are) they can be from different manufactures but must have the same V/ram.
Remember that if you update your Drivers you will need to re-import the profile from where you saved it to back into Nvidia Inspector (because the Sli code was never officially activated by Nvidia, every time a new set of drivers is released and installed, the Il2: Cliffs of Dover profile will disappear from the List).
See this link for installing Luthier's Sli Code: -
http://forum.1cpublishing.eu/showthread.php?t=37316
Check this forum there is always good advise here (you may need to register): -
https://forums.geforce.com/