Maybe I missed something here...

The photos show you sailing uni-rig...no jib. So why did you lower the bridle union from the original high-bridle of the A? Is it to allow stabilizing the spin pole and mounting your cool blue triangular snuffer mouth? The F18HT uses a high-bridle and is snuffed mid-pole. And remind me whether F16 is uni with spin or sloop-spin (jib and spin)?

Did you ever run it with a jib?