Ian,
Just a suggestion (its been a while but I think this is how I removed the throttle in 9.1):
volume move governor*> ?
modify *Modify the governor configuration
show *Display the governor configuration
You should be able to move that data in a pretty rapid period of time. I've noticed when upgrading to 9.1 the throttle is definitely more visible -- even when removing the throttle there isn't a noticeable impact.
I would suggest against keeping the vol move running during the takeover, if its even possible.