Queue limiting traffic to low.

Hi,
Here is the situation:
Client RB750–>UBNT Nano Bridge–>UBNT sector–> Mikrotik RB493
The PPPoE dialup is done from the 750 to the PPP server on the 493, username is authticated via Radius and the Queue is set from the radius.
Now the problem comes in when the client does a speedtest to speedtest.net or our own speedtest server.
their queue is set to 10mbps up & down.
With the Queue on:
5 mbps up & down.
With the Queue removed:
16mbps down/ 11mbps up.

However if we do a mikrotik bandwidth test, we get the 10mbps up & down.

If I set the speeds higher from the radius server to 16Mbps, they get 8 down/5 up.

what are we missing in the config?