Hi Fraser,
Good timing with your post.
I'm sure you weren't the only person in trouble yesterday. It's a reminder of the importance of being competent at self-rescue in a variety of situations, including in off-shore winds.
When you are less than 100m away from shore and the wind is clearly off-shore, my advice would be to activate the chicken loop QR, wait for your kite to flag out, and start swimming right away towards the shore with your board. It's a considerable effort but shouldn't take too long even for an average swimmer unless the wind is very strong off-shore or if your kite doesn't properly flag out for some reason. Since there is only a single line attached to you and your bar is further away, it's easy to avoid getting tangled.
The good thing about this technique is that if you change your mind, you can always either ditch the kite or decide to go for a pack down self-rescue ( as per the video below and as mentioned by gesper above).
It's difficult to do a good pack down and swimming with a packed-down kite is also slow even with multiple struts still inflated because there is usually a fair bit of water lodged around the kite creating a lot of drag. If you can manage to do a really good pack down and drain the water from around the kite by lifting it up on a surfboard and strapping everything with your safety leash, you can potentially reduce the drag to the point where this technique could be faster and easier than other techniques mentioned here. Of course, it's easier with a smaller kite like a 6m but can be a real pain with something like a 12m or bigger. Either way, the only way for a pack down to be effective is to be good at it, which means you need to practice this procedure multiple times.
The biggest issue with deflating a kite is losing lots of visibility from a rescue party. I would
avoid deflating a kite for rescue purposes if you are more than 400m away from the shore or if less than 1H before sunset.As you mentioned, ditching the kite is a good option in cases where swimming back to shore with your gear is simply too difficult or will take too long. Just keep in mind that if you do that, you must notify the Water Police immediately ((08) 9442 8600 for WA) when you get back to safety. This will avoid deploying rescue efforts.
In summary, there are multiple ways to self-rescue in off-shore situations. I don't think one technique is better than the other and it also depends on the circumstances, wind conditions, distance from the shore, your fitness level, if you're a good swimmer or not, etc.
I would suggest that you practice the pack down self-rescue in a very light off-shore wind next time you go at the beach.
www.kitebud.com.au/kitesurfing-online-courses/pack-down-self-rescue/More safety videos here:
www.kitebud.com.au/kitesurfing-online-courses/Hope this helps.
Christian - KiteBud