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The signal from WMAU will be substantially less than the calculated amount since the simulator does not include the vertical (elevation) pattern of the transmitting antenna. Most likely, at this depressed elevation of about 3.4°, the RMS field strength will be about a quarter of the main lobe's strength which is probably 800' above the rooftop at this location. Off the cuff, that means that the signal power is probably 10-20 dB below the forecasted level.
Either the DB8e or the 91XG will suppress the signal from the rear by about 10 (or more) dB. Combined with the lower power due to the depressed angle, that should weaken WMAU by 20-30 dB which may make a bandstop filter unnecessary.
I'd try the DB8e with a Juice pre-amp. I'd also hold off on the VHF antenna, you may not need it for your single VHF station from Jackson and it can, if needed, be added later.
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