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If it were me, I'd start by moving that C2-V to a roof, chimney, or gable mount, clear of any obstructions to whatever degree possible. It's doing pretty good for being mounted in an attic, but eliminating obstructions and reflected (multipath) signals can only help.
If starting from scratch, I'd use the DB8e, with one panel aimed 358 deg. magnetic, and the other around 52 deg. mag. WNSC real 15 should be strong enough to come in through the back of the panel aimed north. For high-vhf (channel 7), the single dipole from the C2-V may not be enough, but that's easily tested with the antenna you have now (aim it north, on the roof, and try). If it works reliably, it may be possible to remove it and mount it to the DB8e, but I don't know that. The dipole kit is cheap enough to add to the DB8e (comes with the UVSJ to combine the signals with the UHF), but being as weak as it is, and 2-edge, something with more gain is likely needed, like the Y10713 or its baby brother the Y5713. Combine with a TVPRAMP1R preamp (which has separate inputs for VHF and UHF, so no UVSJ is needed) to boost the signal enough for a 4-way splitter and 100 ft of cable to the furthest tv down below.
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