Is spin-out a chemical pruner? I don't believe in those. I feel that they are stressful, and that instead if you want to buy time, you should use an enzyme such as Cannazyme to break down only the DEAD roots. But even that should be approached with caution, as it tends to release a burst of nitrogen back into the pot from the broken-down material.

I wait until the soil is dry because it is slightly shrunken compared to wet soil, so it slides out more easily. Furthermore, a very wet root ball is heavy and can actually break apart under its own weight while moving. IF you do it on the dry side, the plant will barely notice the transplant until it feels all that nice SPACE, lol!