Your run: It did seem a little 'tight', but that appears to be unavoidable due to weather. However, your last 3 lefts must increase your speed without increasing stride lenght, so CADENCE (turnover) must increase... you have a problem with this. Are you familiar with 20/20s?
In the sand: You look like you don't stay behind the pole as well as you could. Make your run and take-off a little bit more explosive and centered, and you will need to grip way up. Your pole will begin to flex slightly. Try just staying behind the pole as a drill (Jagodins). (I will be posting footage of myself and some of 'my' athletes doing sand work as soon as KB puts his 'short run vault' post up, so you can check out what I mean then if you don't know what I'm talking about already.) Also try semi-competetive vaulting in the sand from 1-2 lefts. It is (fairly) safe, and it can be a whole lot of fun! (I will also have film of that.) I believe it is better than half-swinging, because once you progress as a vaulter to the point where you have the basics of the swing down pretty well, I feel that you should almost never 'half swing'.
(Also, when filming your run, try to get a side-on view. The side is best for virtually everything!

)
As for your plant: You drop your bottom arm too low. Keep it at chest level, let it go forward, and bring your top hand just in front of your body to start going up. This will make things so much better. You should be impressed with yourself!
