[pHaestus]

You're mixing apples and oranges here somewhat.

The "13 turns" thing is from the Aquajoe blocks, which used a proprietary mounting system and made it impossible for me to use the same springs as in other tests.

Cathar's "5 complete turns for AMD recommended force" is what I went with because frankly no other mfgr even mentioned anything about how far to tighten the springs down. And once I had started testing that way it was easier to continue with the same methodology than to repeat all the testing again.

As far as how I know that the cards aren't being stacked against the 4 spring blocks, I don't live in a vacuum. BillA tested many of the same blocks I have (LRWW,Innovatec rev3, MCW5000-A, MCW6000-A, AquaJoe, etc etc) and the relative rankings of his C/W vs flow and my dT vs flow curves look pretty close. And I recall Bill making custom mounting plates so he could use 4 hole mounting and same springs on all the old socket lug blocks (like Innovatech Rev3). So I operate under the assumption I'm in the ballpark.