Thank you for the post of the accident aircraft. I disagree with your assessment of wingtip vortices as the cause. These aircraft too light to generate damaging vortices.
These aircraft generate a considerable wake vortex at 500 mph pulling G’s. I have seen upsets in all the classes raced at Reno. I witnessed the whole incident from the start at the #8 pylon to impact. Although pictures show a missing elevator trim tab the beginning of the incident looked to be classic wake upset.
Did that cause the elevator tab to fail? Beats me the NTSB had 3 people at the venue and I’m sure they saw the whole thing. Another NTSB person is coming in from DC
It’ll be a while before most of the story comes out