At the suggestion of Mike Simpson, I changed numeric values on this line found in both aforementioned files, just to see what would happen.
<_iMaxParticles d:type="sInt32">75</_iMaxParticles>
The shown value of "75" is the last change I made. It started out at "600" (default) and I kept halving the value until I got to "75" which did result in a noticeable decrease in smoke particle density. Now I've just got to figure out the values, and their locations, for the incremental notch increases in RPM which increases particle density at each level.
