Re: Ditch bag
We also have a few drinking water packets in our bag and some thermal blankets (the impossibly thin metal ones).
Then there's a second canister that has more flares, water and food. It sits behind the ditch bag. If possible I'd throw both overboard when stepping up to the water. The ditch bag really has all I need but comforting to know there may be two flating things that could help out.
And ditto on the liferaft prepacked with survival gerar also. Last piece of advice would be to do a float test with it after you pack it all.