Tested by whom? Certainly not the numbers I've seen and actual use shows this.
Highest clamping force doesn't indicate anything about the power curve of that force. It could simply mean on and off with nothing in between.
If you do a test with different brakes, all with the same pad compound the brakes generating the highest clamping force is going to slow down the wheel faster then the others, what don't you guys get about that? Were not talking about a car with different diameter rotors, rotor thicknesses, vented or solid discs, 4 piston calipers or what ever.
In something like a bicycle road brake caliper the only things that are going to show braking power are related to pad compound, clamping force, and rim surface. You put a control test in place so the rim and pad compound are the same the only variable left is the clamping force. More force, more stopping power. Pretty simple.
Honda, the test was done by Zero G, they have about %6 more stopping power then DA 7800.