the first 50miles, probably even less is where you needed to give it some load, boost, and engine braking.
(not redline and full boost, but at least half a bar of boost and 5k).after 700miles it is too late to be trying a different way to bed in the rings.
do what you got to do though, i would be boosting it for sure after 700miles.
i assume youve had mineral oil in there and changed it a couple of times?