Well......I Maybe have a solution:
DL the very not so latest (there it is- ?) vers of Nvidia Inspector (1.9.7.8)
At a very basic level, you can at least delete the stock DCS/BS profile for NVCPL.
And recreate one, either via nvcpl, or via nvinspector via "new soft"...
But, by looking things around and there, you "Could" get a solution.https://forums.geforce.com/default/topic/548123/?comment=4534646
So do I: my 2xGTX 970 SLI IS WORKING NOW, doing this, + tweaking "starts bits" ( don't ask !) to tell NV that DCS is "a kind of" DX11 sim.
And my boost is about 75%, with DSR 2880x1620 i have a CONSTANT 60FPS with Vsync, with everything maxed Out, except MSAA = 0.
The point is in the mean time ED update DCS to 2.1 and 1.5.6.5199, so i have (a very little)about these change (nothing new in the up log.
BTW, i have as many profile (3) than DCS's install, "Reg" 1.5, Beta and alpa 2.1 NTTR . But i suspect that all of them point to the same, and "the DCS's" call sub app for graph/FMdl/AI etc.....?
Give it a try as it cures my blurries roof on sa342 (whe could see through), and all my plane were GLASSy, even the tires were....varnished ?