Whirlpool Cabrio Won't Drain Properly; no clog present; no error codes on either diagnostic test

Spent our Sunday taking apart our Cabrio per your prior videos, and ran both diagnostic tests and a calibration cycle. Nothing was clogging drain/pump.

1. Do you have any other suggestions as to why the machine won’t drain properly? It’s almost like clockwork that that clothes never spin out on a regular wash cycle. I usually have to hit drain and spin, once or twice before the clothes are spun out enough for the dryer. The pump seems to be trying to do it’s job, and sometimes it work, it’s just very inconsistent. Sometimes there’s 6″ of water in the bottom at the end of cycle, other times the clothes are just real wet.

   1. When we removed the tub from the unit, we could still hear water rolling around inside the -is that normal?

2. There are only two springs on the right-hand side of the tub–should there be four springs around it? We found no springs on the floor or inside the washer.

3. And finally, we found a black powdery substance, which appeared to be from the belt, which looks like it came really close to coming off the wheel–the plastic that covers that belt looks like it had a rut melted into it where the belt rubbed up against it.

Appreciate any assistance you can provide to help us finish the job – your videos are very helpful.
Link to dropbox, to see pictures, is attached.
Thanks,
Terri
https://www.dropbox.com/sh/j50txbmrr7xjcsw/AADLahvk3HHuJnx5e5eotAA7a?dl=0