When I mine, I use 1 toon in an orca to boost and play shepherd. with 11 procurers keeping at range 1 km behind it to dump into the fleet hanger. (i use procurers because it's way easier to keep track of 1 mining laser per ship than 2 or 3) And I run a miasmos back and forth between the hanger and the orca. If I were running hulks or covetors A Miasmos would barely keep up. 8 Covetors would keep a cargo toon busy with an orca on field acting as a fleet hanger.

(I have no experience with Rorquals so I cannot offer any advice regarding them)