contradicting terms - newbie vs SB Formula with 9.8 and larger sails
based on literature both the 9.8 and 11.8 (can't find 11.3) sails recommend 530 cm mast
the 9.8 is 530 + 24 cm on the base setting
so, with the 550 mast, it is as you say - NO extension
ideally you would have rigged the sail at purchase to verify settings, cambers, etc
good luck !!