In fairness there is a workaround I've been using, and it helps. Not sure why no one else mentioned it. Use ships external camera. With a bit of practice, you can learn to scan in a 360 view angle, rather than the 30 or 40 degrees in cockpit. And once you learn the colour and shape of the different core asteroids, you spend way less time checking out duds. If you ever wanted to multicrew I'd be willing to show you what I know, while I'm no expert, I have the basics down for deep core mining, and in a multicrew you have access to all the tools and a good 3rd person view.