Hi,
To have a better understanding how to become a fat burner look at the following article Tips for fasted training
There are lots of articles and to find them is not so easy on the website. My suggestion is to start with the topic Training Practice and sometimes it is worth to reread the articles again as one’s understanding of the principles gets better, one finds other tips that are embedded in the same article. I guess when one is ready, one starts learning.
In regards to terrain, I also live in flatland and I had previously posted a question and Scott Johnston’s answer is probably what you might be looking for. It was in my case.
If you have been doing Crossfit for a long time, I suspect you might have ADS and the only way I have found to cure, is lot’s of volume at AeT, regardless how slow it is. At some point one becomes faster compared to himself or herself at the same AeT. It may take 8-12 weeks before there is a change so you may want to increase the transition period. I don’t know how long the transition period in the 16 week program is, but I extended my transition from 8 to 12 weeks in the 24 week plan.
Hope this helps