I'd try the MXU59 first because it costs less than the 91XG. Both should give you every UHF channel from WAZE to WTVW.
I'd then try the YA-1713 in place of the Stacker for the VHF channels. If this configuration does not work then it seems to me there may be some kind of environmental problem in the vicinity that is impacting your signals.
Amp wise I'd go back to the one you were using originally because it gave you better performance. See if you can return the HDP-269 for a refund. Clearly you need the additional gain that the 8700 offers.
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