Bender, I'm trying to do the same thing, since I'm also getting the same message in the console, but it doesn't work.
I enter the three lines in the console (only with a space between "/cl_maxpackets" and "125"), and THEN try Get New List, but I still get the same message about packet loss and/or high ping. I've tried lowering all the values to half, quarter and tenth of what you said, still the same result.
Any other things to try?