Why not use Mary Woodward's DMN article that she wrote within a couple of hours of the events:
- "The President was looking straight ahead and we were afraid we were afraid we would not get to see his face.But we started clapping and cheering and both he and Mrs. Kennedy turned, and smiled and waved, directly at us, it seemed. Jackie was wearing a beautiful pink suit with beret to match. Two of us, who had seen the President last during the final weeks of the 1960 campaign remarked how relaxed and robust he looked.
As it turned out, we were almost certainly the last faces he noticed in the crowd.
After acknowledging our cheers, he faced forward again and suddenly there was a horrible, ear-shattering noise coming from behind us and a little to the right".
We can see beginning that prior to z170 the President is facing forward and a bit to the right but not sharp right. Jackie is looking left. At this point the President is approaching Mary Woodward and her friends (the President is opposite them at z190-195). We can see that they are clapping. At z170-180 his head turns fully right and looks at them and he gives a full wave of his right hand and smiles. Jackie's head turns from looking left to looking sharp right, as well from z173 to z192, which is one second, . JFK then turns forward by z206.
This is exactly what Mary Woodward described as occurring just before the first shot. She said that she thought that they were the last people the President acknowledged before that first "horrible, ear-shattering noise".
You're making an argument for a first shot @z223 and against a first shot in the z190's
JFK turns forward (@ z206) "and suddenly there was a horrible, ear-shattering noise coming from behind us and a little to the right".
A shot at z223 would be less than a second after JFK faced forward.
In her account, Woodward makes it clear
both JFK and Jackie "turned, and smiled and waved, directly at us".
In the Towner film, at no point is Jackie looking to her right, she is clearly looking to her left.
From z133 Jackie is looking to her left.
She starts to turn @ z170 but it's not until about z190 that both she and JFK are looking to their right. JFK is still waving and smiling.
As you say, this is the moment described by Woodward.
She describes JFK turning to face ahead (this happens @ z206) immediately after which was the first shot (I would argue at z223 which is the only model that makes sense of Woodward's observations)
The Towner film proves Jackie did not turn to her right as the limo turned the corner at Houston and Elm.