If you have the CM3410, then change it out. It can only help. Might not make a difference, but the only way to know is to try it.
Have you tried merging the 91XG with the C2V using a reversed splitter? If that is successful while causing no ill effects (lost channels, etc), then the AC7 combiner won't be needed. If combining the antennas with the reversed splitter does cause problems, then the AC7 is definitely called for.
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