I feel like I am one of few coaches who still jump and experiment with this stuff
I wouldn't say that. I have been experimenting with this stuff as well, however I have gotten some great results attempting to follow the 6.40 model.
See this thread: http://polevaultpower.com/forum/viewtop ... 39&t=21959
I think the results here are compelling as well. Again a case of short grip and in my case a soft pole, but still substantial above grip clearance. I think that its worth noting that in both cases (your videos and mine) we are inside, and this means that optimal technique on these jumps may not reflect "correct technique." Personally I don't think that you are that far off from agapit or vaultman are saying, since I think its all about minimizing (since its impossible to eliminate) things like chest drive after takeoff. Think about it this way, if you were flying down the runway at 10m/s, and took off with an aggressive slightly forward leaning posture and with a free takeoff or prejump, when the pole hit the back of the box your chest and head would move forward to fast (into the correct position) that it would seem instantaneous. Also the timing of the bend would be different, and in this case, pulls as you might, your arm would extend with the pole due to its rapid bending and a correct takeoff posture.
Now consider the opposite, slower runway speed and a very inside takeoff (like mine) in this case the pole is actively pushed up during the plant as the resistance is felt while still on the ground, and more time is needed to allow for the head and chest to penetrate forward. Additionally the arm remains bet longer because the characteristics of the bend are different. After the toe is of the ground the pole has already been bent x %.
In cases of inside takeoffs you are probably better off focusing on driving the chest up and forward, because an inside takeoff will typically try to pull your hips forward prematurely. That's why teaching young people to pull out of context is bad, they need to have mastered the takeoff first. An inside takeoff with terrible posture will make the pull dangerous; a free takeoff will make it terrific.