So I got my software to work and I captured what I needed. The video quality is shite, but that's fine because it still suited what I needed - and that's the audio. The one that came out the best is Vol 3's audio - with the hiss being less noticeable there than the others. Vol. 4 I was surprised that the audio was pretty hissy since I got it new, but it's still good quality. Vol. 8 was the worst, both in video and audio, but its audio is still serviceable apart from a strong hiss. If I recall correctly, the audio from the VHS rip I used back in 2012 was similarly hissy and I still managed to clean it up fairly well, even with my subpar audio editing skills back then. I should be able to clean them well. We'll just see, I'm optimistic.
EDIT: Here's a sample https://www.youtube.com/watch?v=k90rHwfBB1o
I'm impressed that you found a VHS from 1982 or whatever unopened.
1988. From what I've gathered, I feel the tapes were made primarily for a rental market so I'm assuming that there are still quite a lot around.