I’m currently waiting for my first DD wheel to arrive - a Sim-plicity 20Nm OSW (it was dispatched on the very day Britain ground to a halt with snow so hasn’t got very far to me lol) and to pass the time was reading up on other OSW experience with Project Cars 2 (which is my clubs current main racing game) - which led me here!
There looks like some great advice to help get me going once my wheel arrives but in the meantime, in regards to the oscillation with Jack Spades custom files, I might have an idea you’ve not tried.
There is this setting in the custom JSpade files - near the bottom (these were default for the version I have of Jack Spades)
#Deadzone Removal as pCARS 1 - deadzone/fall off
(output (tighten output 0.02 0.01))
These 2 settings, if not done right for your specific wheel, are known to cause oscillations in PCars. I’ll take a guess that the default ones might not suit a DD wheel.
The first one is found by running the Wheelchecker tool from iRacing linear force test a few times then loading the results into the FCM tool to get your own wheels deadzone. (I can get you links to these if you don’t know of them).
The second setting is generally based on what your first one is and if it is too low it causes wild oscillations. 10% of the first one is a starting point.
TBH I’d not expect the default settings to cause oscillations but worth a look as they will if not right for your particular wheel.
Good to hear many have a good experience with OSW and Project Cars 2 though as I had that worry of how good will it work with PCars 2 which I’m really enjoying atm.