I think the main problem with a Spiral is trying to do the whole thing on the count of
4. 1. Instead of standing on the count of 4. and then and only then Spiral on the count of 1. In other words separate them as two distinct moves.

Pretty much, most of the basic variations were taken from Bolero and Danzon ( same for mambo/chacha ) and adapted to the Intern. style .

The speed of the music for each, played a large part, in each figures construction, a good ex being the basic in each of Bolero and Rumba, both predicated on the open Box ( XBL and Fan another ex )also, the change in music...

The Bolero. A piece of music composed by Ravel in 1928 commissioned by a Russian Ida Rubinstein actress and dancer for a Ballet.
It seems it was a solo dance at that time . Some credit for its popularity must go to film actors George Raft and Carol Lombard who in a 1934 danced the Bolero in a film of the same name. Look it up.There is a film clip which can be seen. For the records . There was already a Spanish dance called the Bolero. Its interesting to note that most of the
demonstrations take place on a large round table or stage, which points that in a market place a crowd always form a circle never a square. Even in the George Raft film they are on a circular stage possibly to stay with tradition.

You "picked " up on a very important feature, the " Circle ".

Cuban style dance, as in Rueda,Casino, Son etc, all were designed in that manner .

The music , pre dates the Ravel version by many years .

spirals can be done on both feet :))