In all three scenarios, you're still using a single download. There are bottlenecks that can be associated with a single session (and even more when it comes to IPSec). Things like encapsulation/decapsulation and how it is split across multiple cores, and a whole host of things.
The datasheet numbers are for scale, not for individual downloads from a single client.
I don't want to come across as harsh, I just can't think of a better way to say it. A single download is VASTLY different than real clients connecting and doing regular work.
If you insist on using this type of flawed testing, at the very least try doing several downloads at the same time from different sites on that test client at site B. At least then you'll be using multiple sessions to fill the tunnel better.
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