[isatrader]

when you say the Relative Performance Zero Line, is what I have set up as an indicator below correct to how you have it?

I am using a daily chart below, so does this Relative Performance Zero Line still apply?

(also I am using the Continuous commodity instead of S&P here as my securities in this instance are commodity based ETFs.

No, you've used the same indicator that I use for the unflattened version, and tried to style it as the flattened Mansfield RS. Also, if it's a daily chart then the moving average to use is the 200 day MA. It's the weekly chart that uses the 52 week MA as the zero line. So you need to adjust that on your daily chart.

So from looking at your screen shot, delete the bottom two rows in the settings that have the horizontal line in the title and then you'll just be left with the following:

   

If however, you want the Mansfield RS with the flattened zero line then you need to select that indicator instead of the Relative Strength (Comparison) which is used for the unflattened version. As remember the "zero line" refers to the moving average in the Relative Strength (Comparison) indicator.