These are the following settings to add to your console for KAT servers.
rate 20000 (Set for server tic rate,
20000 for 66 tic, 30000 for 100 tic).
cl_cmdrate 66 (Should match server tic rate, usually 33,
66 or 100).
This setting you will have to adjust to your particular situation.cl_updaterate 66 (Should match server tic rate, usually 33,
66 or 100. Adjust down in increments of 5, until your
choke reaches 0. IE; 60, 55, 50, 45, 40 etc).
(NOTE: You will need to turn on your netgraph to see your choke. Open console (hit ~) type net_graph 3 Console is first enabled via; ESC/OPTIONS/KEYBOARD/ADVANCE/ENABLE CONSOLE) 
ALSO, During game play, you may need to make periodic adjustments to your cl_updaterate lowering it back down to reduce choke as players join increasing server load.~KC
