i used the Code:Red 11,6 with 560 against 550, so i can give you just general feedback to your set up.
the pros and cons:
your weight is good reason to use stiffer mast to have even better lowend with your gear. for the biggest sail (12) is good, for around 11 is not needed. the stiffer mast generate deeper profile sail what is important at the boom area to have more power to planning earlier.
on the other side the downhauling will need more power. when start to be over powered, the sail getting little bit less controlable with the stiffer mast.
hope its help,