Dont leave your kite above you, especially in gusty or light winds have it at 1 or 11 max. Then it will fall to the side not nose down. Always apply a bit of tension on the bar will stop your kite moving forward and dropping out.

Shortening your rear lines a little will have it sit back a little but will reduce your windrange and depower, you're better fixing your bad habits.

Light wind kiting can be difficult and frustrating which is why many kiters simply avoid it. You'll definitely get yourself in more troubles in light wind compared to normal winds and your equipment or tuning often won't be the main cause. As Nick mentions don't park your kite at 12 and more importantly keep it moving all the time, especially when you fall off your board. You'll also benefit from downlooping your water starts and transitions when the wind is very light. Best for you to stay closer to the shore for now and work on flying skills and water relaunching skills as well, before venturing too far and finding yourself stranded with no one else around to help... In general light wind kites will fly deeper in the wind window to generate the most power while making it harder to go upwind. Pulling the trim strap in a little bit will make a big difference in your upwind performance. Also make sure you inflate your kite rock solid (8PSI in your case) as this will improve flying and water relaunching performance. I hope this helps!

Its a scary feeling. I had this happen to me once at St kilda in my Early days! Not good when 100's of people are watching.
Try tuning your kite till you find a sweet spot!