Hi Eric,
Scripting and testing with swings can be quite complex because of the underlying data exposed in the testing engine (for a detailed explanation see here).
However, I think the issue may be that you are using different swing lengths, so the 11% swing won’t turn down after every 5% move as the 11% swing may not have turned up yet…
To display both swing values on the chart you would need to apply the overlay tool twice, one using 5% and the other 11%.