Sorry to hear you are having trouble. The DB8e should be doing at least as well as the C4 based on gain figures.
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on the roof with nothing connected to the antenna except the receiver.
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No preamp?
Maybe ADTech will stop by and help.
I wonder if the antenna needs to be aimed a little up from horizontal by tilting the top back? The 91XG has that tilt provision, but not the DB8e. There are documented cases where the tilt feature of the 91XG made it possible to receive signals that were otherwise impossible. It is possible that the incoming signal is arriving at an angle above horizontal because of the curvature of the earth and the hill that is about 7.5 miles out. I have noticed that I sometimes need to tilt my 4-bay antenna back to aim above horizontal for a max reading on my signal level meter.
The C4 has a vertical pattern similar to the C2; there is no notch where the gain is reduced:
And the DB2e has a similar pattern:
BUT the DB4e and DB8e have a deep notch (null) in the pattern:
and the 91XG also has a notch, which makes its tilt feature useful:
In the last case I worked on the optimum angle was 15 degrees.