Solo training in hurricane?

[Redroach]

Another issue came up!

I decided to check out the max speed of my hurricane. So, according to the diagrams in the manual, I have to go up to around 24,000ft.
But this seems nigh-impossible. My crate starts to shake badly at around 13-15,000 ft, the engine "pauses" shortly sometimes and getting further up is a real pain... before various engine parts blow up, (radiator is fully open) and oil starts to spill on the windscreen. The maximum altitude I reached this way was around 21,000 ft.
However, while knowing about simplified FM and such, letting the autopilot fly up to 24,000 ft goes really smooth, almost like it's being dragged up by a rope or something. As the altitude is reached and I take over, the shaking and bouncing starts immediately and things go south quickly, engine-wise.

Do I have to activate a fuel pump or something? I read about such a pump in a RL-Huricane-Manual I downloaded. What should I do with the mixture?
The crate should easily be able to reach that altitude... Max alt of the Hurricane is over 10km

I can only repeat... quite a step up from Il2-1946!