Since you don't know me, I should let you know that you are sort of preaching to the choir. I already know that I like the results of intentional counter movements, that include the pelvis, that I use. I also already know that I like the benefits of pulling the inside foot back. It sounds like you and I are close to being on the same page of the book with respect to skiing movements.
If we don't actively create counter, it won't happen. Just "allowing" counter, doesn't result in counter. It takes active countering movements for counter to occur. Without active muscular engagement, the body seeks positions of lesser tension, so in order to create counter and to hold our counter until after we've released our edges, we must actively recruit the correct muscles and simultaneously relax the correct muscles that would otherwise oppose the movement caused by the engaged muscles. Counter doesn't happen by just allowing it to happen.
The appearance of a stable upper body is a result of very active countering movements, not by a lack of action that seems to be implied by: