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Can you post a screen shot?
I don't know what you mean by adding or subtracting HFD's. Hfd's are irrelevant to the offsets.
If the Step figures in ccdap are all minus, then it means that all your other filters are one one side of luminance focus point (either inside of focus or outside, depending on focuser travel direction). Personally I would focus on one of the colour filters as a reference filter on a refractor, due to minute amounts of chromatic aberration, even on the 106. I personally use red.
The CFZ calculator is a part of ccdap, from memory under tools tabs.
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