We list the gauge of strings that we choose for a particular model to please most peolple, most of the time. This is not a dictate or necessarily even a a recommendation.
The FS will be OK with mid tension SCGC strings if: The action is maintained at a reasonable height (no more that 3/32″ as measured from the bottom of the low E string to the top of the 12th fret). The neck should be adjusted to a proper relief for your playing style. There is a thorough description of this under ‘Care and feeding” at http://www.santacruzguitar.com Do note that when changing tensions on your guitar you may need to adjust neck and action to maintain the same settings that you had become accustomed to.
All the best,
Richard