I don't think you can do any better. You need the narrower beamwidth of the 8-bay antenna to separate the weak signals from the strong local signals that are only about 12 degrees away in azimuth.
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most of the Dayton channels I want to receive (all in red on the report) will be in the 30 to 36 channel range. With that in mind, and using a preamp which 4 bay has the best reception of channels in that range?
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Antennas Direct DB4e.
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And, would I be better off trying a different preamp than the RCA? It is not overloading at all
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I'm surprised that it isn't overloading; according to your report, the preamp AND your tuner should be overloading. Maybe the trees are making the signals weaker.
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I think I've read there are other preamps available that offer a little more gain in strong signal areas while not prone to overload.
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Those two factors are mutually exclusive. You can have more resistance to overload with less gain or you can have more gain with less resistance to overload, but you can't have more gain with more resistance to overload.
The Antennas Direct Juice preamp has more resistance to overload.
According to your report, WCPO has a signal power of -12.0 dBm and WRGT has a signal power of -91.6 dBm, for a signal dynamic range of 79.6 dB. To that, you must add the minimum required SNR of 16 dB for the weakest signals, which gives a SFDR (Spurious Free Dynamic Range) of 95.6 dB, which is impossible. The best preamp with gain has a SFDR of 81.7 dB. The Mini Circuits ZHL1010 has a SFDR of 92.2 dB, but it only has a gain of 10.4 dB.
If you think your idea will work, why don't you try it?