SmartThings Hub Swap Issues

I’m having a ton of problems migrating to the V2 version of the hub, specifically I started removing devices one by one from V1 but about 50% wont actually remove despite the fact they are controllable by the V1 hub. Any thoughts on how to do this either more efficiently or more completely? I’m rather concerned ill end up with a bunch of devices in a stuck state.
Devices are mostly Leviton Dimmer Switches.

Any thoughts or guidance would be greatly appreciated!

I was doing that, half work, half just dont remove then SmartThings gives me the option to force remove.

I agree. Remove your outer-most devices, first, and then work inward.

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I did that, and what’s odd is they still can be controlled by ST.

So force remove all the factory reset en mass?