Re: break in!
I would run 1/2 to 3/4 throttle for the first tank of gas. Then run 3/4 throttle most of the time with a full throttle thrown in on each ride for a few seconds for the next tank. After that you should break it in the way you plan to ride it.
Yes, you will feel more power/speed as your engine breaks in. The compression will increase as the rings "seat".
That's my $.02. I'm sure you'll hear 1000 opinions on how to break them in. This method has worked for me.