Hello James
I got a few questions here
Have you checked VIA is not set doign split tunneling?
What i can think of is this;
You got set the VIA with split tunnel
You got set the rap doing tunneling mode
That would explain your issue.
Why?
Well if you got your via with split tunneling and you using internet testers to see the BW speed then of course it will work great on the remote site as you using your own internet
Now let see the case of the rap which is not using split tunneling and its using tunnel mode
Here you download will depend on your upload speed of your company internet, if you got a crappy upload in your headquarters then this would explain the issue.
Check if you dont have your VIA set with split tunneling and the other set on tunnel mode
Im testing mine and its wokring fine on version 6.1.2.8... and also tested witha version 6.1.3.5.
Cheers
Carlos