Jeff,
Sorry I didn't have time to find you and have a chat during the 3 days of racing. There was just too much happening.
You weren't the only one to have their mast stuck in the mud.

Two Mozzies went over in unison at the bottom mark during one of those bullets.

At least it was warm in the 23 degree C water.
I don't know the answer to your question and will leave it to others who sail with spinnakers.
Regards,
Peter.