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The 91XG was designed to be a highly directional UHF antenna. Any VHF reception it gets is due to coincidence rather than from its design. i would never recommend it for VHF reception although I have heard from numerous customers that they DID get VHF reception with one.
Think of a comparison of an antenna's design band in a way similar to our vision. In the antenna's design band, vision is excellent. But, the further the frequency of an out-of-design-band channel is from the antenna's design capabilities, the more "near-sighted" the antenna appears to be. As someone who required vision correction from an early age, I can tell you that being close or have larger images allowed me to cope with near-sightedness. Similarly, receiving VHF signals on a UHF antenna will happen pretty much only when the signals are particularly strong. Your DIY antenna, it appears, is able to receive enough of a VHF signal to allow reception. Your antenna may be near-sighted on VHF, but it isn't blind.
The HBU series are high-VHF/UHF combos and are suitable for use as a single antenna solution. We happen to have decided to offer separates which we believe offers greater flexibility in designing a system unique for any user. There are advantages and disadvantages to either approach.
Your desire to receive relatively distant (weak) signals without a rotor leaves few options: 1) Pick a city and stick to it or 2) Use two separate antennas (or pairs) and select the active antenna using an A-B switch or 3) Investigate a DIY design such as the GH that has a bi-directional option.
if you look at your TVFool chart, observe the numbers under the "Real" column. This is the channel that the signal is actually transmitted on and the one that is important for antenna selection.
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