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Grounding should have no effect unless there is a defective component in the signal chain.
There are reliable tools to measure signal power but they are not inexpensive. Check your TV's Diagnostic menu for a signal meter. If it measures SNR, that can be useful.
I suspect there's nothing wrong with the CDA4 or the splitters. I also doubt that the DB8e is the problem, although I highly recommend the separate panel test I previously gave you as a confidence measure.
I suspect you have a coax cable fault in the premises. The most likely fault that would cause your particular symptom is a coax with the shield shorted to the center conductor. This can be tested with a standard ohm meter. For each cable, measure from the shield to the center and you should have an open circuit (infinite resistance). A shorted cable will read zero ohms. F81 couplers would also be suspects.
What is the history of the coaxial cable in use?
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