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Mike, I don't see any times listed for the Amsat tracking. I think the problem is people are saying that HRD "lags" (ie, the track is correct, but several seconds/minutes behind). Regardless of if that is true or not, what I would suggest to verify HRD's tracking is to open two windows, one with AO-91 or 92 in HRD (realtime, during an actual pass), and one with Amsat Argentina's website:
Be sure to enter your correct grid square and select the correct satellite, and it will tell you current Az/El and doppler frequencies for Uplink and Downlink. I've found this site to be very reliable, and no installs are required (it runs in the browser).
--Roy K3RLD
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Regarding the control of two VFOs simultaneously... we're working on this next. On another note, I've been comparing satellite passes between HRD Satellite Tracking and AMSAT's tracking and I am unable to find any differences. Here's an example with AO-91: http://www.hamradiodeluxe.com/AO-91-Pass-min.png
Mike, WA9PIE