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Hi Mike,
How do you control & measure the effect of your cooler on the camera ?
Myself and a few others on here having gone down extensive experimental paths with cooling DSLRs and have found any external cooling systems are minimally effective at best and the only consistent solution is the cold finger behind the sensor with TEC and temp management.
I have a modified Canon 450D which gets a 20* delta on ambient as measured at the sensor ( BYE reports the CPU board temp ).
Our experiments with cold boxes and thermal transfer points certainly took internal temps down 5-10* but as soon as power was applied the temp rose faster than the system could remove and near ambient temps were the best acheived.
To be useful you need to reliably and consistently achieve deltas of 15-20* below ambient at the sensor. The general rule being that every 5* drop halves the noise at the sensor.
EDIT: Yes, I was going to mention gradient as well
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