I have a more complicated equation for tension throughout SSP but it requires more discussion than is possible here. The ankle's pivot point is at the top of the triangle, and the fascia is at the bottom, running parallel to the ground.
Compression is in the bones and tension is in the fascia.
Obviously, tendons and ligaments will also have tension in them that relieves the fascia, but they are addressed only indirectly here. The bottom of the foot has a distribution of forces pushing up. W. The distances can be in any consistent units such as centimeters. Q, H, and P vary as the foot deforms and as the force at the ball extends forward. T is lowered because the force under the ball has been reduced and supplemented by the force under the toes and that force is being transferred as tension through the flexors instead of through the fascia.