>I've had good luck putting a 1uf 50v NP cap across the couplers for random opening.
But were they isolated coils? Mine are grounded on one end. Now I am remembering this from a loooonnnnnggg time ago, but I never tried the caps because Jon said, paraphasing "caps won't help you, if they did you wouldn't need them because the Commander already has them".
So did you actually have (and solve) coupler opening problems on a Commander-equipped engine?