> but it appears that move set does not change all the subscriptions to
> the orgin node?
> (...)
> how should I go about moving subscription on node 2 to point to 3 instead?

Yes, it does not. I just tested it today, when I tried to drop original
node after moving set and got error that it is still subscribed.

But bare resubscribing the client do
(after move set just do

  subscribe set (id = <set-id>, provider = <new-master>, receiver = <receiver>, forward=yes)

and receiver will switch to new master)

>