So a mate sent me this, it explains how YAW relates to turning a foil.
kiteforum.com/viewtopic.php?f=196&t=2398338&sid=499b66d9f114b827d9fe28d2020f7cf8
finally a great day to lock in heel to toe to heel combos staying up on foil, may take a while to upwind toe but was happy following the waves drifting toeside