Hello Gentlemen,
I don't happen to have the Kagero Top Drawings book on the Hayate, but I know that others in the series are VERY good.
Other useful references are Volume 70 from the old Aircraft Profile series. There may be more than one FAOW book on the Hayate.
One has 1971 volume 10 No. 20 or something like that on the cover. The other is FAOW 19 as already mentioned.
There are also the Report on the Ki 84 that was examined after the war at Middletown, PA that is a pretty good read.
It isn't the easiest thing to find even for me and I was the one that uploaded it a few years back.
It can be found here:
Middletown Test Report
- Ivan.
P.S. That should be JMSDF, not JNSDF. M = Maritime. I worked for them on a contract a long time ago.