You could and would have been just as well running LOP from the start. points to note, high mean effective pressure is what you need to break in the engine, you can achieve that ROP or LOP, but the LOP option is actually better.
We just did an RV8 with an IO375 that way, worked a treat and the cleanest oil I have seen
As for learning about LOP,
www.advancedpilot.com plenty you can learn there.
WARNING: The lean find function is all engine monitors are great teaching tools, and for your education, but they are ineffective in obtaining optimum results in everyday flying. Hysteresis in probes and the algorithms in the software are never a good match for you, your brain and raw data.
Best way to do normal inflight leaning is to do the Big Mixture Pull, let things settle for a few minutes. Then slowly find the first one to peak from the lean side, take note of the raw data peak, and then lean back to the appropriate LOP amount. That could be 60-80dF at high powers, 40dF around 75%, 25dF at 70% or around 10-15dF at 65% or less.
WARNING #2: Most engine monitors %power displays are wrong, Dynon being an exception. How you tell is if the % power does not change when you go LOP, then it is just doing a ROP only calculation.
If you are at 75% power Rich of Peak, when you get appropriately LOP you will be around 10% less than that, in other words 67-68%. So you do not want to be 40dF LOP then, rather say 10-120dF LOP.
Get good at doing a BMP, and you will never use the "Lean Find" function ever again, unless you are teaching the concept to a newbie.
Useful links for you; Deakin articles and Red Box simulator.
https://www.advancedpilot.com/tech.html
Hope that helps