CS:S server jitter/lag

[nightrider]

After the Valve Steampipe conversion of Counter-Strike Source
our CS:S server has been having sustained server jitter.
The server was rock solid before the Steampipe update.

Exe version 1718178 (cstrike)
Exe build: 17:56:44 Apr 22 2013 (5280) (240)

Metamod:Source version 1.10.0-dev
Build ID: 830:ca911754b95d-dev
Loaded As: Valve Server Plugin
Compiled on: Mar 31 2013
Plugin interface version: 15:14
SourceHook version: 5:5

SourceMod Version Information:
SourceMod Version: 1.5.0-dev+3832
SourcePawn Engine: SourcePawn 1.1, jit-x86 (build 1.5.0-dev+3832)
SourcePawn API: v1 = 4, v2 = 4
Compiled on: Apr 16 2013 11:39:35
Build ID: 3832:8ac22e807fe5



network settings in server.cfg

sv_minrate 13000
sv_maxrate 50000
sv_minupdaterate 33
sv_maxupdaterate 67
sv_mincmdrate 33
sv_maxcmdrate 67
sv_client_cmdrate_difference 30
//sv_client_cmdrate_difference 10
sv_client_predict 1
sv_client_interpolate 1
sv_client_min_interp_ratio -1
sv_client_max_interp_ratio -1
net_maxcleartime .01
net_splitpacket_maxrate 40000



We own our server
TYAN 1U rack
Windows Server 2008 R2 x 64
Dual 6 core CPUs AMD Opteron's 2439 SE @ 2.8Ghz
32Gb error correcting server RAM
Professionally collocated server at Ubiquity hosting in NY city.