RE: Thank's for helping out.
I didn't really "come after you" so to speak, but whenever I see someone down in the water for more time that it takes to waterstart or uphaul, I kinda just go by and check. Funny stuff happens out on the water, especially when it's deep. So using the "buddy system" really works. Fortunately it was only a simply mast disconnect (which I may have caused by not fully clipping in your Chinook adapter) but getting a mast foot reconnected on a Rio Large in deep water is sure no fun.
I'd suggest a seat type harness (if you don't already have one) for use on your Rio L.
You will soon be out in the footstraps, all the way back and flying over the water, and for a larger rig, and the big wide board, I think a seat harness works the best.
If you aren't getting hooked in all the time, maybe get a waist harness as well as they are a bit easier to learn with.
Hope this helps,