I think I may have fixed it. I removed the tub again and this time really jiggled it down to seat into the outer plastic tub. The problem might have been that when I placed the inner tub in, it might have been off on the threading below by a tiny amount…this then tiled the bin very slightly. After the reseat, it seems to be spinning without interference.
I also had to shave off the tiny plastic pieces which were abraded off from the previous failure situation so they did not hit each other and cause me to think the 2nd fix did not work.