I have a problem with the term "settle weight down" ... I am not a native speaker so this may be a misunderstanding.
settle weight down sounds for me like loosing the straightness of the spiral, so moving to the next steps require to lift the upper body weight... I never let my upper body weight down... I dont wanna lift it up again and again... I have more the association with a steel feather (my spiral)... hip moves side & back, chest moves other side & forward ... and the steel feather (spiral) stretches to the roof and press my feets against the ground, my body lenght is always maximum.
But your right. at every & you have to do a body action.. hip movment like in rumba its the necessary preparation of the next step. difference between Cha and Rumba is that the presentation phase is longer in rumba. In Cha its short and you do imediatly the body (hip) action to hit exact the & beat. Cha is f***ing fast.
You have to do this at every step
new yorkers, fan, twinkle, whisk, turkish towel, follow my leader ... doesnt matter. you have to do it forward, backward ,side, syncopated timing, guapacha timing ...it never stops . if you do a step at a & beat there may be a body action and a step or a body action at the "a" before the & ...
Cha is hard stuff 