Good work on Joe's part and I understand the desire for repeatable, measurable mounting parameters...
But - if all waterblocks are tested under ideal mounting conditions to obtain accurate C/W data, isn't this creating a false sense of comparison since in real world applications Joe Customer will probably rely on the hardware supplied with the block (bolts, clip, springs, ???) most of which will produce less than ideal mounting pressures.
If the goal of testing is to repeatably measure a waterblocks C/W then fine. But that data is then used to compare one block against another - still good info under ideal mounting conditions. But at the end of the day it doesn't necessarily provide a good indicator of how one block will perform vs. another under real world mounting conditions. Block A may have good heat transfer abilities and a poor mounting arrangement while block B has an excellent mount but poor C/W. So which is better for the end user???