I found the March 18/09 video (camera on bleachers) telling. And it, plus the competition, shows a reasonable amount of consistency on the approach re: change to run/acceleration compared to the indoor competition video.
If I may…when in doubt keep it simple.
From what I see the approach run (if you feel it is consistent enough) is now at the point where it is “usable” in that it will continue to change little bits at a time as you refine technique a bit more and as you get stronger, carry more velocity etc. but it is at a point where you can move on to the next “stage”.
You can make that next “stage” a “small” detail, say reducing the number of fouls or you can decide to move to the next “big” stage and to me that is in the air. Whatever it is you do in the air.
Either choice, large stage or small detail is valid, and you can of course work on different features at different practices. All I am suggesting is following the “order” of the event. You run, you jump (air), you land (what happens at landing). It sounds silly/anal but sometimes if you are struggling (or making major changes, as you are) keeping it overly simplistic until each part sorts itself out is the way to go. Clearly you are more than willing to work at it, so give it time and yourself a chance. It will improve more just when it is a bit warmer and you don’t have to brace against a cold wind.
My only other thought is, if ever possible, get someone with a keen eye watching you. You can tell them what you are going to do, generally ask about a precise detail after but in doing that you run the risk of the next “sample” (next say take off in you case) that they will be so focused on seeing that detail they will miss something else you may ask about. An overall sense tends to be more useful in my experience (K.I.S.S as already posted earlier) unless it is an experienced event coach and that person will have a “feel” for what to look for and do next.