Gregg, I'd be thinking if your harness isn't installed properly, Hans or no Hans your in trouble should you need it to save you. Correct harness fitment is a given.
While sprints currently don't fall under the mandate, many event promoters strongly advise having them. Up here every drivers meeting its spelt out... GET ONE!
I'd suggest going forward they will be pushing for sprinters to take their safety more seriously. The days of long sleeved shirts, enclosed shoes and gardening gloves are on their way out.