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doesn't seem to matter to the graph whether I turn it on or off?!?)
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The C-Weight check switch in REW only affects frequency areas not covered by a meter .cal file, so in this case above ~100Hz. Make the scale of your graph go from 10Hz to 20,000Hz and observe the effect of the C-Weight switch. Also remove your .cal file and observe the effect of the C-Weight switch. The .cal file replaces those areas of the C-Weight compensation to create a more accurate curve to match your specific meter...
If the Radio Shack meters actually had an accurate C-Weight response, then a .cal file to over-ride the mathematical C-Weight compensation provided by REW wouldn't be necessary.
brucek