Settings for my previous post. **Stewer** was of course right that the first Irradiance Cache parameter has no effect with IDL on, so I put it down to zero. **piz99** was right that it really was the Irradiance Sample Size that mostly controlled the distribution of red dot evaluation points. I raised the second Irradiance Cache slider about as far as it would sensibly go - somewhere beyond 90 the renderer starts acting like the room normals were reversed again and **Stewer** says Poser won't take anything past 100 anyway. I set this high to crowd evaluation points around the gap between cards. That worked, but the blotchiness got really bad. I raised the Sample parameter by a factor of 16, hoping for a "noise" reduction of maybe 4. Believe it or not, the blotchiness here is quite a bit better than it was otherwise, but that cost drastically in render time. Any other critiques on quality appreciated. Also, I'm very new at this stuff and wonder if there are any pros out there that could offer an opinion as to whether this is an easy scene or a hard scene to render with Global Illumination. Thanks.

Whichway