I've always done performance break-ins the hard way. On a motor with a fresh hone and new rings, I just let it idle and rev to 2-3k under no load for 30 minutes with 10W30 synth. Then change the oil (10W30 synth) and filter, and head out to the dyno to start doing low boost pulls. Compression and leakdown were always great. Made a ton of power. Never had any issues.

The explanation I was given by the person who taught me this was that you need to load up the hard rings so that they file against the fresh honed walls while they're roughest. Made sense to me.