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I expected it to be as strong as horizontally stacked but I was wrong. The only problem I could think of was all these connections added up to a signal loss.
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That is one possibility. Did you use 300 to 75 ohm baluns from another source? The loss of baluns is not constant for all frequencies. If you used different baluns than used by the manufacturer, there could be losses from a SWR mismatch.
When I combined two 4-bay antennas to give more gain for channel 15, I tried about 20 different baluns. I found that the loss on that channel varied about 5 dB between the best and worst baluns.
OTA signals constantly vary in strength, sometimes as much as 10 dB in a half hour. The only valid test would be with a constant strength test signal and a signal level meter which gives a reading in dB.
These are the signal level meters (SLMs) that I use for measurements:
