The late and highly regarded Kevin Ash put an article on his site about running in with input from Castrol: http://ashonbikes.com/content/running
The best advice I was given was not to lug the engine in high gears and spin the engine up and down rapidly. Modern engines don't need exacting running in but doing the whole 600 miles at 65mph in 6th won't kill the engine, it'll just delay running in for lower gears until you use them. I'm on my 3rd GS/GSA but over 30 bikes in total over the years and I believe the boxer engines need about 10,000 miles or so to run in and get nice and smooth. The GS I gave up at 8,500 miles was just starting to feel sweet.
Totally agree about engine needing 6000-10000 miles for it to hit sweet spot.. I've run in 2 LC's and my second 2014 LC had the engine replaced with the 2015 so in truth Ive done 3 LC's in the last 2 years. Use back roads with as many hills and bends as possible and USE it. Don't go beyond 6000 RPM and you will be fine....Enjoy !!!!