Trying to figure out mining as an viable alternative to bounty hunting.
Just not having much luck at it.
You do not really need a hotspot in my experience. That HS only indicates the majority of the material you find in the cores. Pick pristine.
And yes, core mining is a good alternative to bounty hunting for me. Perhaps because I regularily fail at bounty hunting.
Pick a spot in the shadow of the planet. Do not use night vision. Fly a bit above the plane of asteroids. Ping the Pulse Wave.

Those asteroids which are yellow and far away are usually the cores and get brighter, the nearer you get to them. (Others will also become yellow as you approach, remember those intially far away asteroids. Here we have two, lucky find).
If you are not in the dark, e.g. not in the shadow of the planet, those far yellow asteroids are almost impossible to see. Night vision can also be too bright for distinguishing them. You need to be almost upon them then when the sun shines.

And watch all around (use headlock) when pinging, you have maybe 3 seconds after each ping to spot one, sometimes only one second.
The cockpit of the T10 is ideal, the keelback is fine too. The Anaconda and Python are useless IMO in that regard, the DBX too, their cockpit blocks the lower view (flying them upside down helps).
And maybe pick a (pristine) Ice Ring. The only less valuable material in cores in an Ice ring is bromelite and even that can be asked for in missions.