I’ve tried both. A medium clamp fully clamped give the hardest clamp. I can then push the clamp down the shaft and then kegel. After I release from pushing down the pressure is immense.
Lately I have been going to only 3-4 clicks and getting similar pressure but better girth through out the clamp. So for me the tighter the clamp the more length I get at the expense of girth. So the penis bends up further, lengthens, and the girth drops.
Any more than 10min seems to get more fluid than expansion and the same seems to be true for more than 3 x 10min sessions. I did 7 x 10min sessions and all I got was more lymph fluid.