I pulled the data from my Dynon and plotted CHTs over time. It took a while to filter out the unneeded data, but I finally got down to the flight I was interested in.
I saw a temperature drop in all 4 CHTs within 15 minutes of about 25 degrees. It didn't seem to last long because they all pretty quickly recovered to the 360 degree range (no change in MP or RPM). I saw another small drop about 50 minutes into the flight of about 5 degrees. But overall, after about 20 minutes everything seemed to be fairly stable.
The whole flight only lasted about 1.5 hours, so I don't know if that is enough time to really draw any conclusions. I intend to continue the break-in process for another 10-20 hours. But right now I am very happy with the temperatures I have!
I hope that helps.