I don't want to be impolite, but I did some VO mining over the last couple of days in a Cobra MK4 and without any special widening of the FOV. I was able to mine 58 tons in 40 minutes (a bit lucky perhaps, but other sessions were not that far of). I can't say how you mine in particular, so I don't know for instance why you are using a big and sluggish ship for core mining, when only little outcome is to be expected. And no glowing rocks at all? Then something must be really broken on your side as this is far off from what I experience.
Apart from that, I'm again in uncharted regions and was extremely lucky to find now a double VO spot with almost perfect overlap (looks like a single hotspot, only 0.01 Ls apart). At the moment I'm ordering my FC and then I'll finish for today. Tomorrow I will have the rare opportunity to find out if this will help to increase the possible hit rate...
It's the spot(s) in the center of my HUD:
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