This whole discussion has convinced me that I am right to be afraid to sail my slow and lowly Wave on the same course with the big, fast spinnaker boats.
I was scared off the course at Spring Fever last year by two near misses with spinnaker boats, and I doubt if I will ever again sail in a multiple-class regatta unless there is a separate course for the slower boats.
AND I think the fast boats will be happy to have one less obstacle to avoid.