Here's an NU 15 minute chart with 1000 and 2 for the large and 500 and 2 for the smaller COG. I'm actually already in this short trade as of Friday for other reasons. Let's see if the COG reacts like I expect it to.
In the case of NU, price seems to respect the green levels in the larger COG rather than the brown. I'm guessing the green levels are equivalent to dynamic 61.8 and 38.2 levels.
EU 15 Minute seems to like the larger sampling rates as well. I think we can still use this thing on the smaller time frames as long as we compensate with the large sampling rate.
I keep noticing where the smaller COG and the larger COG key levels intersect usually make good trades. I've noted a few of these on this chart in both directions.