CEM Hurricane Vibration and Smoke

[justme262]

I have been unable to fly Hurricanes Spitfires or Messerschmidt above 21000ft.

The first thing is the hurricane mixture control lever. In real life it is rich aft lean forward. against the convention. If you look closely you can see a little sign in the cockpit...rich -> aft.

In game the DH hurricane is lean aft and rich forward and the rotol hurricane is rich aft lean forward...confusing! The throttle is supposed to push the mixture to rich when you close the throttle but this is buggy in both hurri.

Apart from that issue, the auto rich setting should lean the mixture at altitude without the pilot doing anything. But the engine vibrates and blows smoke like it's running too rich.
I wonder if this is supposed to correlate with Full Throttle Height. About 18000ft or so in a hurricane. So maybe we have to progressively reduce the throttle the higher we go over FTH. Even doing that there is no way I can approach 30000ft which a hurricane mk1 could supposedly do.
But my understanding of full throttle height is sketchy to say the lest.

The 109 has auto mixutre so there is nothing you can do except lowering throttle and/or prop pitch. but you have to lower them to idle to stop the vibration...

I love the complex engine management but it maybe has a few bugs to iron out yet...
The first time I flew a ju87 across the channel bombed a Dover radar( missed actually) and flew home with out breaking my engine was very satisfying indeed!