Thank you for the report. I will study it, get back to you, and try to make some intelligent answers.
The first thing I notice is that you have two signals strong enough to cause preamp and tuner overload (when the antenna is aimed at them) which would produce spurious signals from IMD that would raise the noise floor and wipe out your weaker signals.
It sounds like you have picked the best location possible for your antenna.
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I also thought about adding a rotor, but it looks like most of the decent rotor manufacturers have gone away...
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Not too many left; the CM9521A is popular, but it doesn't have long-term reliability. You would have to step up to a ham rotator like the Hy-Gain AR40 or Yaesu 450.
http://www.eham.net/reviews/products/24