The Hub manager shows the connection speed between your computer and the exchange.
Thinkbroadband and Speedtest show the actual download speed achieved and will vary during the day due to various factors.
Do a test at
http://217.35.209.142/
This will show:-
1. The connection speed eg 5088Kbps
2. The IP profile (throttling by the exchange). Should be 4000Kbps at the above connection speed.
3. The actual download speed. Should be just below 4000Kbps.
To get the IP profile of 4000Kbps you have to maintain your connection speed of 5088 Kbps for at least 3 days.