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Expect any amplifier to overload...
The HD7000R is a very good choice... as mentioned already, it covers the channels now available and those that may be coming on the air soon.
With the signal levels shown in your report, I would resist the temptation to use any amplifier. You're less than 2 miles from the Sutro Tower with several stations operating at 1 million watts ERP. That means most amplifiers will be overloaded... the loss in your cable and splitter will be a good thing because it will reduce the signal power delivered to your tuners to more appropriate levels.
As an aside, amplifiers don't 'pull' signal from the air, the antenna or coax... They amplify everything fed into them, including noise and interfering signals. Amplifiers increase signal power but do not increase the signal quality. That's because they add distortion and noise to the signal over and above what was at the amp input. Good amplifiers will only add a small amount of noise and distortion... but even the best amplifiers cost you some signal quality.
Reliable reception starts at the antenna, if you don't 'make it' there, an amplifier may mask some of the problems, but it won't fix them.
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