You need a lighter retrieval line, that is for sure
The processed image is attached. I had to cheat a little as the seam lines dont go horizontal, and the image was not too good (collapse at the second retrieval patch).
As you can see the measurement show that your spi has a draft of ca. 27% at 46% and 49% from the luff. I would say that this is too deep with draft too far aft. Was your kite trimmed for light wind in the pictures?
Why dont you try lowering your spi pole a notch and see what happens to the luff and shape?
If you want to play with the software yourself, it's available at: http://www.ukhalsey.com/accumeasuredl.asp
It runs fine on all modern windows versions, and under Wine in Linux.