As a P-51 flyer myself I'm also gonna weigh in, prior to 4.10 as everyone knows the P-51 had some yaw instability problems which made it kind of infamous for spinning and wagging its nose back and forth uncontrollably during banking (Applying the normal rudder during bank didn't make a coordinated turn as it should have), and this upset the aim (so everyone was bitching about the .50's instead lol). This was all rectified when the length bug was corrected and its now quite a sweet ride again.
Now the new spitfire FM does not seem as unstable as the old P-51 IMHO in terms of 'wagging' oscillations (I just took out a few la-7s and when the elevator was trimmed correctly it was a nice ride), I think it's mostly an issue of what speed the trim is set for.
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