Danshep They are supposed to be adjusted first, which I did. Nobody ever has a manual on how to adjust them.
To understand what a filter does, see this white paper:
You adjust your filter so that the center of the passband is perfectly centered at the Hα wavelength -- this will give you the best contrast since that will give you the best chromosphere vs the "noise" from the photosphere. I.e., tune it for best contrast. The chromosphere should just pop-out of the while photosphere as you tune through it.
You add the double stack to get even better contrast, since the filter is even narrower and has a lower Gaussian tail (the above article call it "wings," but I have always known them as "tails of a Gaussian" from my math courses).
(This wiki page also calls them "tails" https://en.wikipedia.org/wiki/Sub-Gaussian_distribution .)
That being said, you do not want to use a double stack filter to look for prominences.
A bandwidth of 0.7 to 1 Ångström is better for prominences than a narrower double stacked filter, which often is in the 0.3 to 0.5 Ångström region.
If you can, remove the double stack, and use only a single stack (I don't know if that is possible with your set up -- I am not familiar with Lunt; I use a SolarScope SF-50 etalon).
Switch back to a double stack to look at the chromosphere. That is what you paid the extra moolah for.