Very Poor Performance w/Vulkan and Crashing with DX11

System:
Win 10.0.19042
Processor: Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz, 4001 Mhz, 4 Core(s), 8 Logical Processor(s)
Motherboard: ASUSTeK Z97-C
RAM: 24GB
Video Card: Gigabyte Aorus NVidia GeForce RTX 2070 Super
Driver: 496.49 (updated a few days ago)
Drive: Some Samsung SSD

PoE Settings:
Steam Client
Everything on lowest, except 16x Anistropic Filtering. MultiThreading ON. VSYNC off.

Standing in Lioneye's Watch:
DX11: 180 FPS
Vulkan: 45 FPS

Standing alone in Hideout:
DX11: 155 FPS
Vulkan: 61 FPS

Seems like DX11 is the answer, but with DX11, I get random crashes while mapping. The game seems to run fine and then suddenly the sound and videos stutter very briefly (1 second) and then the game closes, with no error. Just straight to Desktop.

Seems like Vulkan is the answer, and just put up with the lower FPS, however, I get a LOT of visual artifacts from nearly every effect, and the game is nearly unplayable. This is solved if I switch Multithreading OFF, but then the FPS is even worse.

Which RAM sticks are you using?

Roughly how long does it take for the client to silently close under DirectX?

4 Sticks. Both the same make (Micron), but purchased at different times.

CPU-Z tells me:
Dual Channel DDR3, 24 GB (2x8gb + 2x4gb)
DRAM Freq: 666MHz
FSB:DRAM: 1:5
CL: 9.0 clocks
tRCD: 9 clocks
tRP: 9 clocks
tRAS: 24 clocks
tRFC: 200 clocks
CR: 2T


The CTD is always leads with the same symptoms: I'm spinning around and suddenly, both the graphics and sound stutters 2 times, the first stutter a shorter interval than the second, from which the game crashes. The time between the first stutter and crash is 1 - 1.5 seconds. As soon as it stutters the first time, this always leads to the crash. It's the only time the game stutters as such.

If I had to be detailed in guessing the time, I'd say it goes:
Stutter 1: .25 sec
Brief return of movement and audio .25 sec
Stutter 2: 1 sec
CTD

After this second stutter, the client immediately closes. There's no time to measure, I'm just back at the desktop immediately.

Hope this helps!

Any update or help on this?