Python with single 2D mining laser (because of subsurface target works best in old versions of game).
THat's a non-sense
Legacy and Live are completely separated. So you can have your Legacy python with 1 mining laser and your Live python with 3 mining lasers.
If you want to do proper laser mining you need to fit 3 medium mining lasers, have at least 6 limpets (preferably more), keep the nose of the python as close of the asteroid as possible while positioning yourself so the flow of fragments go under your ship where the limpets can catch them.
Not at least, make sure you drop in the center of the Hotspot. Material density in asteroids (for laser mining) greatly decrease if you move farther than 10% from the center of the hotspot
PWS is useless, there is a ping that it found something, but no visual indication.
I'm wondering if this is a unique situation or some unpublished "fix" of the game mechanics.
Nope, PWS is broken indeed, but laser mining is unchanged. This is how it worked since they last time nerfed, back in 2020
And for someone FAR in the black, there is a raw fix for the PWS - relog.
So, get in the ring, PWS will work in about a 20-30km radius, mine that radius, move 30km away, relog - PWS will work again in that radius, mine, move, relog, etc.
Not ideal, but it's basically the only way to mine SSD far in the black.
Else, resort to finding hotspots and laser tritium out of the asteroids