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Fixed. Turns out my rear rotors needed replacement, and I was feeling it in the steering wheel. I know it is crazy, but the problem was 70% reduced changing my front rotors. Now it is 95% better+ after changing the rear rotors, too. At this point, I am over $440 into brakes, but I am satisfied with the results; I think.
One of my friends at a car dealership told me the G37 suffers from brake hammer. If a rear rotor on the left is warped it sends a pulse of brake fluid to the front right, and the rear right will send a pulse to the front left. Apparently it is something with the proportioning valves but the fluid cannot back up into the reservoir when you are putting your foot on the brake.
Regardless, the shakes appear gone.