Is this your setup now?
Code:
AmzAnt > coax > ControlBox > 15 ft coax > Olevia
\ UHF /
UVSJ diplexer > splitter >
/ VHF \
CH 6 Dipole Antenna > coax > 75-100 ft coax > Samsung
Your new TVFOOL report shows stronger signals. You could be overloading the preamp in the Amazon antenna and the tuner in the Olevia TV. The extra length of coax for the Samsung acts like an attenuator at 6 dB per 100 ft for UHF.
I don't know the signal attenuation for the attic location, but outside your strongest signal has a Noise Margin of 69.9 dB even before adding Amazon antenna gain and its preamp gain of 36 dB.
http://www.ebay.com/itm/HDTV-Outdoor...-/310464020303
http://www.ebay.com/itm/150MILES-OUT...item19d492f779
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html