British FM killing the fun of the game for allied pilots.

[Crumpp]

pilots don't seem to note any actual problems

Well the pilots did note the same issues the NACA recorded.

for example, in the prototype:

From Handling trials of the Spitfire K.5054

The control is satisfactory as regards "feel" and response, but would be improved if the movement of the control column for a given movement of the elevators was slightly greater.

Keep in mind, he made absolutely NO MEASUREMENTS but this is all opinion from watching the ratio of blue and green out of the windshield, LOL.

Longitudinally the aeroplane is neutrally stable with engine on and stable in the glide.

http://www.spitfireperformance.com/k5054.html

Longitudinally, the aircraft is stable with centre of gravity forward, but is unstable with centre of gravity normal and aft with engine 'OFF' and 'ON'.

http://www.spitfireperformance.com/k9787-fuel.html