I too would have a hard time picking a large person out of the water. Here are a few things that I have thought about reading through this thread.
The Lifesling 5-1 hoisting tackle for powerboats would work well I think if the boat had a swimstep and room to pull a person over the transom. I would think that the carabiner could be attached to the roof rail and the victim could be pulled over the swimstep, transom and into the cockpit. They may do a face plant upon entry, but small matter at this point. Even with a davit, you are not going to get the person up high enough to easily swing them aboard. The lifesling, plus the length of the blocks looks to be 1 to 2 feet. The majority of the victims weight is going to have to be dead lifted over the side of the boat.
Another thing that I have thought about is what type of clothing to wear when boating here in Puget Sound. Because I kayak all year round, I am very aware of an unexpected cold water bath. I never wear cotton clothing when kayaking or when I am out in my CD in the winter. Here is a good link that talks about what kind of clothing works best at keeping in body heat when wet.
http://www.dnr.state.oh.us/watercraft/safetips/dresscold.htm Polartec fabric is my first choice.
I wear a inflatable life vest most of the time when I am out in the CD, but I will switch over to my kayak PFD if things get a bit rough. I feel the kayak PFD, which is very comfortable for me (I am used to wearing it all day while kayaking) adds more cold water protection, is easier for someone to grab and pull me back aboard, and is less obstuctive in the water. The down side is that is has less buoyancy than the inflatable. I think that if things got really bad, I would put the inflatable on over the kayak PFD.
Another thought that has been at the back of my mind since I bought the boat is the wisdom of having a drift anchor aboard in case of loss of power in heavy water. I would really appriciate any input about this subject.
Tom and you crew, you did a great job. I hope if I ever get into trouble on the water you are close by. The experience that you went through has made many of us stop and think about what we would do in a similar situation, how we can make our boating safer, what safety equipment to have on board, and I think a big issue-hypothermia. This is a subject that is essential that we all stay up to date on. Even in 70 degree water, it can be a killer. I am going to do some reading today and do some refresh work on the subject, especially, how to treat the victim of cold water immersion. And, I am also going to go buy a waterproof handheld VHF.
Robbi