Hi, I listened to your interview and thought I would throw in my two cents. I find subtle processing is the key. I used iZotope RX2 denoiser and after sampling some hom/hiss at the rear of the file was able to reduce the noise.
https://rcpt.hightail.com/2693232662/4d98e0f4b66548057fb75493744ef91d?cid=tx-02002208350200000000&s=19105
Cheers