On Friday, September 28, 2018 at 6:50:58 PM UTC-4, Retting wrote:
Don’t give up, keep evaluating. Find the answer. This is important.

R

If the stick was full back(it may not have been), the loop would be tight enough that it would not seem like the second, or third, would have been at a much greater speed.
I've done enough loops in high performance gliders to know that if you don't relieve the pressure a bit at the beginning of the down portion you run out of energy on the following up portion.
I wonder if this was a spiral that looked like loops from the point of observation. In a spiral the speed will increase and loads will rise until failure.
It is very possible nobody was flying due to GLOC.
FWIW
UH