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If you're committed to the attic installation, you can always try moving the antenna around by small amounts. For example build a mount that lets you slide it around in X/Y and up/down by say 6"-12" at a time. You might be able to find a hot-spot that works for all of them. UHF can be very finicky, to the point were inches matter. The issue might be even more pronounced in the attic.
As for the Clearstream 4 with- and with-out the reflector (V vs. MAX in your case), I think your general assessment is correct. Removing the reflector should help pull in stations off the back side (and possibly to the sides), to the detriment of the stations out front. I might be wrong, but I don't think the wider beamwidth of the Clearstream 2MAX would help for your Charlotte stations since they are both at the same tower. But the wider beamwidth off the back side might help with WXII.
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