Looking for Performance Monitor metrics to confirm I've effectively optimized a computer.

Over the last few years, some of my subcontractors and I have compiled a pretty thorough checklist for optimizing a Windows XP or Windows 7 computer. With most computers (not all) we're able to significantly improve performance. (We're really aggressive disabling Startup items and somewhat aggressive disabling Services.)

I'm at a point where I'm trying to numerically quantify the effectiveness of my optimization efforts. During the last few optimization sessions I've run before/after analyses with the Performance Monitor (perfmon.msc) using the following parameters.

      <PARAM NAME="C00001.Path" VALUE="\\COMPNAME\Cache\Data Map Hits %">
      <PARAM NAME="C00002.Path" VALUE="\\COMPNAME\Memory\Available MBytes">
      <PARAM NAME="C00003.Path" VALUE="\\COMPNAME\Memory\Page Faults/sec">
      <PARAM NAME="C00004.Path" VALUE="\\COMPNAME\Memory\Pages/sec">
      <PARAM NAME="C00005.Path" VALUE="\\COMPNAME\Memory\Pool Nonpaged Bytes">
      <PARAM NAME="C00006.Path" VALUE="\\COMPNAME\Network Interface(Broadcom 440x 10_100 Integrated Controller - Teefer2 Miniport)\Bytes Received/sec">
      <PARAM NAME="C00007.Path" VALUE="\\COMPNAME\Network Interface(Broadcom 440x 10_100 Integrated Controller - Teefer2 Miniport)\Bytes Sent/sec">
      <PARAM NAME="C00008.Path" VALUE="\\COMPNAME\Network Interface(Broadcom 440x 10_100 Integrated Controller - Teefer2 Miniport)\Bytes Total/sec">
      <PARAM NAME="C00009.Path" VALUE="\\COMPNAME\Network Interface(Broadcom 440x 10_100 Integrated Controller - Teefer2 Miniport)\Current Bandwidth">
      <PARAM NAME="C00010.Path" VALUE="\\COMPNAME\Paging File(\??\C:\pagefile.sys)\% Usage">
      <PARAM NAME="C00011.Path" VALUE="\\COMPNAME\PhysicalDisk(_Total)\% Disk Time">
      <PARAM NAME="C00012.Path" VALUE="\\COMPNAME\PhysicalDisk(_Total)\Avg. Disk Queue Length">
      <PARAM NAME="C00013.Path" VALUE="\\COMPNAME\PhysicalDisk(_Total)\Avg. Disk Read Queue Length">
      <PARAM NAME="C00014.Path" VALUE="\\COMPNAME\PhysicalDisk(_Total)\Avg. Disk Write Queue Length">
      <PARAM NAME="C00015.Path" VALUE="\\COMPNAME\Processor(_Total)\% Privileged Time">
      <PARAM NAME="C00016.Path" VALUE="\\COMPNAME\Processor(_Total)\% Processor Time">
      <PARAM NAME="C00017.Path" VALUE="\\COMPNAME\Processor(_Total)\% User Time">
      <PARAM NAME="C00018.Path" VALUE="\\COMPNAME\System\Processor Queue Length">

Here's the crazy thing, none of these values appreciably improve. I would expect some of the memory, physical disk, and processor parameters to show some improvement, but I'm simply not seeing it. Should I be looking at other parameters? Is my logic flawed?