My alternative approach - log vs log(log) from 01.11.2011 to present. Conclusion: The log-log model seems to better fit the data than the linear-log model, and according to this model we are actually slightly under the trend line. Comments?

Let me get this straight: we've been going super exponential all this time?

Could you draw this out on a log(log) chart as well?
It may be just a fluke, but super exp. at least fits best for this time period. Here is a log log chart. The blue lines above and below is drawn by hand. The actual price in log-log space have been added manually to the left of the vertical axis. The chart was not really meant for publication so a bit rough.

Thanks a lot for sharing this. Very interesting