dual connection of ignition coils question

I wish to run two ignition coils in parallel (opposite phase) for increased voltage output. The driver circuit (not shown) is made to allow such a dual configuration. However, both ignition coils I'm using are slightly different, and I am unsure how to connect the high voltage grounds since there doesn't appear to be a distinct high voltage ground lead on one of the coils. I have connected the high voltage grounds together in a way I

*think* they should go, based on resistance readings, but I want to be sure since I'll be placing the coils under oil. Here is the circuit and resistance readings (by the way "Coil 2" also has no resistance between either primary wire and the core) :

Thanks, John