Of course the usual static grounding of wind generated static electricity is essential. Any kite antenna MUST have a path to ground. A choke or a high value carbon resistor should work. In the case of a 160 meter antenna, the AM broadcast blocking filter could easily be designed to have as its first component something to provide a DC path to ground. A kite that has fallen into the ocean is a monster sea anchor.
Rip tide can make a kite impossible to retrieve.
Kites have been built with collapsible harnesses. This is probably a great idea. Basically one examines the harness that holds the kite in the right aspect to the wind stream. Find a critical part that sets the angle of attack. Make this with a link of much weaker string than the rest of the harness and the flight line.