NascarFan, Welcome to Techsurvivors!
There are many reasons why you may get low modem speeds.
First try the other script, can hurt, if it doesn't work, go back to that high speed script.
Try and check your phone cords, make sure it is as short as possible to your outlet from your computer and in good shape.
If the US Robotics modem has a control panel or configurator program or from OS 8.6's modem control panel, check to see if there is a selection of settings for your connection speed and choose the highest speed possible.
Your 6360 will not be able render web pages as fast as newer computers, but the connection speed should be able to connect higher with the right settings and environment.
Last resort if all else fails would be to call your phone company and ask them to do a line check for noise on your phone line, they will tell you if your line is noisy or clear.