Game crashes at start menu.

I upgraded my graphics card from NVidia GTX 480 (x2) to a single GTX 780 ti card and since then have been unable to play the game. Here's what I've tried:
-switching off aero desktop
-deleting profile (multiple times)
-various combinations of startup switches including:
--noland switch (allows me to get to the main menu, get to the editor, then crashes the game after about 60 seconds)
--nosound switch (still crashes)
--skipIntro (allowed me to read the DLC popup, but crashed as soon as I clicked OK)
--nobenchmark
-I tried rolling back drivers (still crashes)
-I've tried using latest drivers (still crashes)
-Beta and non-beta forms of Arma3 (no difference)
-I've tried overlocking my card
-I've tried underclocking my card
-I've tried reference clocking my card
-I've tried installing Windows card timeout fix (no significant effect)
-I've tried forcing VSync on and off in NVidia panel options (no effect)
-I've tried reinstalling DX11 from Arma3 root directory (no effect)
-I've tried removing Saitek HOTAS and rudder pedals (no effect)
-I've tried removing TrackIR (no effect)
-I've tried unplugging my second monitor (no effect)

I can get past the loading screens every time.

But once the world loads in the background of the main menu, the game crashes pretty much every time.

If I underclock my card, I can sometimes get to the editor if I'm fast, but then it crashes.

Once or twice, I've tried going to the video settings and hitting "Detect" which causes a crash.

After installing most recent update to the game, I got a blue screen and the computer crashed, not just the game. But that only happened initially. Now I just get regular game crashes at the main menu.

I'm at a loss. Please help. I haven't been able to play the game since October.
Link to my DXDiag tests as well as latest .rpt file:
https://www.dropbox.com/sh/6tybcu265ye1can/AADmiEPGOcMTnUsHB2KRhGJ6a?dl=0 {F25218} {F25219} {F25220}