Why are you working so hard to do asteroid mining? At DNA, and I can tell you that they have a solution that would easily get tons to Earth per hour w/o all this effort. They just are not using it. Think 2cm convex lens strips overlapped on bottom of a "broom" to sweep up surface direct to Earth. AI cycles the half circle ports to mine 1 cm deep per cycle. A 3m wide broom does 265 kg an hour at 1 kmh movement.