Here is a plot of the Thunderbolt cold starting with the "initial DAC voltage" setting set to the peak value of the initial spike (and not the 10.000000 MHz setting). The upward spike when the unit starts tracking sats (it took around twice as long to start tracking sats) is gone, but the DAC voltage had a new little glitch in the curve when it started disciplining the oscillator. Once the disciplining got underway, not much was different between the three different initial DAC voltage settings.
General conclusions... the initial DAC voltage setting does not affect the overall disciplining, but can affect the time it takes to start tracking sats. Your best initial DAC voltage setting is probably at the 10.000000 MHz point that the auto-tune function uses.
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