I read many threads about adjusting the tension: they are either specifically about a certain cubes or the way to achieve it. I am more interested in the feeling/result you are trying to reach that indicates you the tension is right.
Personally, when I can do the RUR'U' algorithm in a fluid motion, say like turning a bubble of water in my hands, and that the corner cutting is effortless (without any resistance), then the cube tension is set to my tastes.
Personally, when I can do the RUR'U' algorithm in a fluid motion, say like turning a bubble of water in my hands, and that the corner cutting is effortless (without any resistance), then the cube tension is set to my tastes.