>> I have refreshed the network settings for your account
>> Please logoff from the internet and restart your computer.
Excellent.
That means that theyve applied a new account profile in their systems, a reconnect is required to pick up this type of profile change.
>> However the maximum has been 2958Kbps download and a minimum of 1738Kbps.
Hmm.. not so good
Although theyve obviously lifted the 1Mb cap you are still not getting the full 8Mb speeds that you should be getting.
Your upstream is fine and indicates that youre on Tiscali LLU, But which profile theyve put you on now I dont know. - They also have several more.
I would continue to monitor for a short while and see if you can see any pattern and get back to them again.
Try keeping with just one speedtester for a while - Thinkbroadbands is normally pretty accurate. You can also create a login and they will graph your results for you too.
If it doesnt improve then its back to Tiscali again Im afraid.
They may say you need to wait 10 days whilst your line settles in.. but tbh this shouldnt be required on your account since youve already been syncing at the higher speeds anyhow.