It's a bit hard to understand the info you are giving. For example, the link to the BT speed tester is just that! It doesn't show your results, which would be very useful. (Ah, just before posting - I get you. BT test said configured throughput during the test, and IP Profile in the result, of 3000kbps. Plus a download speed of 1300).
You have to copy/paste them. (As far as the end of the upstream figures - the verbiage below is useless).
Also "I used to connect at around 1920k with a connection speed of about 1.5Mbit"
? You connect at your connection speed. Do you mean an IP Profile of 1500kbps?
Please can you tell us the exchange, so we can check for any obvious congestion? The link to what samknows
says would give us other information as well as the exchange name.