I feel that adding colors to septs symbols is unseen outside of the red dot on farsight enclave (which is already "deviant").
Adding the two bars remind too much the Ksi'my'en sept which is not related to Falshia.
Maybe a wave to represent the ocean ? Like that
(I have a SVG template of all septs symbols for all castes, so if you want a base vector image to tinker with in Inkscape, I can provide it to you)