It's interesting to see how much and how quickly forward momentum can be generated by a cricket bowler!
IMO, that's the best thing you have going for you.
Remember, in American baseball you need to start with your foot on the rubber. No steps allowed when leading up to the rubber as in cricket.
So, start balanced in a stable, comfortable position and proceed with delivery. This will feel funny for awhile.
I'd suggest getting that down and redo the video and submit it.
Just my opinion;