What do you pay for that service?
How long have you had their service?
Being you are on a 256 D/L I am not sure this will work for your tweak, but you might try this:
http://www.testmy.net/forum/t-1703
On the first post towards the bottom of the post.
(like a little paper clip)TCPOptimizer.zip (178.93 KB - downloaded 760 times.)
Click on the ^^ and it has premade settings. Double click on the TCP Optimizer*Click on run* and follow the instructions in the post exactly. Make sure you back up your current settings, you may want to go back to them.
Those settings are designed for a little larger D/L I think, but it may work. And simple.