What Stage motion would one introduce a pinch of Axis Tilt to the Witch's Brew? When the stroke goes to Pivot Stroke Delivery?
That's right, Bucket. The Axis (the Spine as the center for the circumference of the Shoulder Turn) tilts when the Hip Slides. On the Downstroke, you don't tilt it by leaning back. Instead, just 'bump' the Hips left while you keep your Head Stationary. Hip Slide is Weight Shift and Axis Tilt.
How much Slide? Listen to Ben Hogan in Five Lessons:
"There must be enough lateral motion to shift the weight to the Left Foot."