OK, after doing some back to back testing offline (after the patch) I think the Ki84 might not be so bad afterall. Here is what I found:
At SL the F6F is 5 MPH faster than the Ki84 with WEP, 5 slower without WEP, but at 5K the Ki is +/- 5 MPH faster even with the F6F using WEP. Speed is not great, but its not bad either.
BUT.....
Speed is not the only thing...the Ki84 outclimbs the F6F (even when the F6F is using WEP) by 5-600 FPM from SL to 5K, and it outclimbs the F4U-1D (even on WEP) by 800+ FPM. That is a SERIOUS advantage in climbing ability considering it is basically on par with the F6F speedwise, and it outclimbs the F4U-1D by a wide margin.
It has (to me) very nice handling below 325 MPH, above then it gets mushy and it starts creaking well before 400 MPH (probably about 375 MPH).
So is it what I expected it to be? No. But more importantly, can I work with it as it is and hope for improvements or an additional model? Yup.