I have never flown a Spit in real life either.

I Flew solo in a C-172 for the first time in 1959. I fly on.
I have flown a fair number of carburetor fed, piston engined aeroplanes.
In my experience.
Pushing the aircraft's nose down moderately should
not cause the engine to immediately quit.
Airspeed should
not be immediately, and drastically reduced, apparently directly related to RPM.
Mass and Momentum, should serve to keep things moving along.
In my humble opinion Eh!