Project Cars 2 crashes

Ubuntu 18.04
AMD RX580
16G RAM
dxvk 0.60
wine staging 3.11 x86_64

dxvk HUD shows Vulkan running, Polaris RX580 card, fps as high as 212 during the opening video.
Menus work, audio works, G29 wheel recognised.
Soon as Start is selected for a race, fps drops hard, progress bar freezes at 68%
The following error is in Game log:

WARNING:PushPullFIFO.cpp(182)] PushPullFIFO: underflow while pulling (underflowCount=1, availableFrames=0, requestedFrames=480, fifoLength=12288)

Anyone else having better luck yet?