Your signals look OK. How are you connected? Can you connect directly to the modem and see what happens?
Try a Visualware quality test. You must have Java installed and active in your browser.
Go to »
myspeed.visualware.comClick on the USA
Try to find the yellow pushpin closest to you (hover mouse over one to see the location) and click it.
After the regular speed test loads (yellow/green), click on 'Quality' in the list of tests on the upper right.
Wait for the quality test (red/blue) to load.
Start the test.
You will get additional details about lost or resent packets.