Two points to mention regarding trees. The first is that any reasonably stout tree will resist any vehicular impact with the only damage being some stripped bark which regenerates in a few months. I have personal experience of this, revisiting the same tree to write up multiple accident reports over several years,
Secondly, if the aircraft was already banked over at a significant angle, it would pass through the gap in the trees without making contact with either side. That would be in agreement with the findings of the original crash investigators who believed the aircraft hit the railroad embankment with a very high angle of bank.
Perhaps this is the basis of the somersault speculation.
Your investigations have certainly helped to fill in vital gaps in the investigation reports curently available, but they also increasingly tend to support the findings of the original investigators in many ways. I find that rather reassuring in the sense that the crash investigation appears to have been conducted with all the care and diligence expected given the tools, methods, and equipment available at the time. Professionalism at its best. Just like today, the press reports appear to be full of inaccuracies, speculation and a certain amount of sensationalism. Gilding the lily a bit to sell more papers perhaps.
The true story may not be ending quite how you wish it to be, but it is certainly proving to be a most interesting journey through aviation history.