Heya Karnak. I've completely fallen in love with the Ki84. However, I have never reached 500mph in it without shredding parts. Most of all I have never gotten it out of a 470-480mph dive without losing both elevators. First 10 sorties or so I flew it after I got back from my leave from AH I lost the elevators several times when trimming it out of dive. Now I rarely go above 450mph. Not needed, it's best at slow speeds, there it beats anything.
Guns are crappy IMO though compared to other 20mm. What I easily kill with a snapshot in the 205 often requires two passes in a Ki84, not to mention hispano equiped birds.
That's part of the reason I'd like to see the B version either as a cheap perk or as a very low ENY plane such as ENY 5 or even less.
Bug, you're one of the best 38 drivers out there and got me fair and square and surprised the hell out of me when ya flipped it up there and shot my wing off

Pleasure killing and getting killed by you
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