A typical problem for men is the maintaining of the promenade position, in particular the rightward twist of the upper body, as they rotate to the left between step 1 on the RF and 2 of the LF. The upper body typically wants to take part in the leftward rotation, causing it to square off to the body, and ultimately pulling the lady out of position. As with any promenade figure, no matter which direction the rotation of the whole body unit, the upper body must be turned as far to the right of the lower body as possible.
Another typical problem for men is the feet between 1 and 2. The right foot must pivot after taking weight, with the left foot held in CBMP. I see some men not turn the right foot enough, or sometimes not soon enough. It has to twist very deliberately against the floor, and it has to always be in advance of the body, rotationsally speaking. Sometimes I notice a problem with the left foot being held to the floor as the right foot twists, taking it out of CBMP. In order to keep the left foot in CBMP, it must trace along the floor in a circular motion as the right foot pivots, not by trying to trace a circle, but by simply holding it in CBMP.
From 2 to 3 the left foot often ends up hooking behind the right, rather than moving back in CBMP. A good way to get a feel for the correct action between 2 and 3 is to have the lady stand on 1 foot while you continually walk backwards around her (in dance position -- fallaway, actually). Each step should be back, although the left foot will be in CBMP and the right foot will be tracked slightly wide. If you can keep the lady balanced on her foot, and each time you step to the LF it feels like a back step rather than a hook, you've got the right feeling for step 3 of the Big Top.
As for step 4, well, that should feel like a basic slip pivot. If you're good at slip pivots and you've mastered steps 1-3 of the Big Top as described above, you should be home free. If the slip pivot gives you trouble, then that, I suppose, is a discussion for another day (or another thread).
Regards,
Jonathan Atkinson