I have a single screen with VRR enabled, capped at 60 fps on the driver software using FRTC and not Radeon Chill.
The simulator graphics settings are at default values. Stuttering has become less of an issue lately. Asobo engineers have been successfully engineering stuttering out of the simulator, and it also seems that AMD developers did some major improvements to their drivers.
My monitor brightness flickers when the frame rate drops below 48 fps. This is because that value exceeds the minimum refresh rate for the monitor, so instead of slowing down from 48 to 47 Hz, it speeds up to 94 Hz instead, and holds each frame for two refresh cycles. This causes some monitors to change brightness level visibly. So if I expect dips below that value, I cap to 45 fps or below using Radeon Chill.
Now since you’re running capped at 30 fps, I recommend you disable VRR, disable the frame rate cap on Adrenalin, enable v-sync on the simulator, set it to 50% of the monitor refresh rate, and ensure that Windows is set to 60 Hz on all displays. That should give you a silky smooth constant 30 fps with no hiccups.