On the temps - all else the same (ambient temp, flow, method of reading the temp, etc.) ?
Are you sure you aren't getting too much thermal compound between the die and block? (from my experience the compound should be thin enough to be translucent when you take everything apart).
What about the mounting pressure?
Regarding mounting pressure and springs... I don't know what the specs on the springs that DD provides are, but springs are spec'd by the amount of pressure it takes to compress them from full to minimum height. If you knew that, you could calculate how far to compress the springs to get the right pressure on the core. If DD selected them properly, then at full compression you would have just the right core pressure... I would suggest contacting DD and finding out from them. (from the pic on their sight it looks like 3/4" inch compressed spring height...)
If you can find cup washers at your local hardware store, that would solve the 'spring scrunch' problem.
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