Just tried a quick few sorties to test it out.
It turns out that the largest benefactors of the new FM change, as was expected, was the 109...
...and quite unexpectedly, also the Ki-84..!
The Ki-84 is DA BOMB now.
I'm sure many of you guys would remember the discussions on Ki-84s. Most of the people who know how Ki-84s fly agree that its largest weakness, apart from maneuverability loss and disintegrating at high speeds, is that the plane was momentarily very unstable and twitchy just before it entered speeds that allowed its first notch of flaps to be deployed.
Ofcourse, once the flaps are deployed it can manage super-tight turns unlike any other. However, in order to reach that status the pilot had to go through a temporarily dangerous stage between 185mp~200mph IAS, where the plane became very unstable and 'twitchy' as the 109s were. It was during this phase where other planes had a window of opportunity to outmaneuver a Ki-84 and shoot it down, before the fight entered a stage where the Ki-84 excelled in.
Well, here's the good news for Ki-84 fans.
That's all gone.
You don't need to get all tense and shaky when getting ready to dump E and start lowering flaps. The plane flies crisp and stable right up to the point where the first notch of flaps pop out. No wobbling, no destabilization, no crazy snaprolls. Just throttle back, kick hard rudder, pull stick gently until signs of stall buffeting shows... and voila, the flaps are now ready to be deployed.
In other words...
...the Ki-84 has now officially become the first Axis fighter to join the annointed ranks of the "point-and-click" planes! It has now become bona-fide antidote to Spitfires(turny plane) and P-38s(crazy loopy plane)

... as now our Ki-84 is turnier than the Spit and loopier than the P-38!
Hurrah!