This is strange ...
I just disabled SLI in Nvidia control panel and ran the last quick mission.
It ran like dog shit. 35fps with micro stutter flying low over the ground.
Enabled SLI in CP ...BUT left the launcher 3d options SLI rendering mode set on "Nvidia recommended"
Ran the same mission and it ran perfectly 45-60 fps no stutter.
The 1 card was 100% and 2 card was 10% but both cards have core, shader clocks and memory graphing high.
For some reason it runs better with SLI generically turned on but then "launcher" set to Nvidia recommended.