Some of the key Minor players are still very much active - Keiji Haino, Tamio Shiraishi, Tori Kudo, though documentation for their work in this period is a little spotty. For Haino, Watashi Dake and the 1978 Fushitsusha (Eien no ho...) are round about the right period. For Kudo, try the Noise "Tenno" album.
The best realtime glimpse of the scene was the Aiyoku Jinmin Juji Gekijo compilation on Pinakotheca, unfortunately never reissued.
Other glimpses can be gained through the very early Kousokuya CD on PSF, which was actually recorded at Minor. Gaseneta and Taco are other threads worth pursuing.