I'm a lowly LMT, but I use KT regularly in my practice and have found that levator scap spasm can usually be relieved by activation (taping origin to insertion) of the muscle. My take is that the dominant arm seems to be to upwardly rotated and stretches the levator. What you said about arm position during salsa dancing would make sense in this context.

Try having your practitioner tape from the transverse processes (or as close as possible due to hair and sensitivity) past the superior angle of the of the scapula with the muscle in a stretched position. If you are experiencing pain before the taping, you should know pretty much right away if this works. Manual therapy of the serratus anterior, which I suspect is dysfunctional from the arm hovering in space when dancing, can also help.

Hope this helps.

Barton