Tips for the Hull C?

I've tried a few times now to get an experienced hauling mission done in the Hull C. I consistently encounter issues with the auto loading / unloading though and wondered if anyone had any tips or had encountered the same things., and had workarounds for them.

Also, is there a way to check exactly how much cargo has been loaded on after an auto load has finished? I'm never sure the entire load finishes loading and not sure of a way to check.

When I finally managed to get a full cargo load on board, when I got to the destination it unloaded 4/3500 SCU and then just stopped there and wouldn't unload any more, saying it was all done.

Another time I was about to jump away when the cargo place I'd just finished loading with called me and said I had more to load on. So I headed back to the loading spot and it just kept kinda ticking over saying it was loading, but never loaded anything. In a Hawkes gaming vid (which has been EXTREMELY helpful so far, hats off to you sir if you happen to see this) he said that all you need to do is go and get the cargo loading revoked - but I'm not sure how to do that?

At least I know to just leave the game and join a different server though if any issues are encountered. Last time I was this rank I lost a cargo load and progress was reset to hostile and I didn't get a new starter hauling mission until about a week or so later.