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I looked at your most recent bode plot. I believe what you are seeing should be coined "time delay" rather than "phase shift", although the two are basically interchangeable. Looking at the bode plot and doing some estimated calculations of the shift at 10MHz (-15 deg) and at 100MHz (-145MHz)...
You said the input to the oscilloscope comes off the board, through an SMA connector, through a 50-ohm BNC cable and directly to the oscilloscope-is that right? Considering you are measuring a high frequency signal, you should definitely be using an Oscilloscope probe. You said you're very new...
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