Mary,
I have to give in to your greater knowledge. I am sure that it is the limiting factor.
That means that I must be doing something wrong, I know that on my 5.2 I don't even have to watch the lee bow, granted I do sail solo and can trap off the very back of the boat.
I know that I have to start dumping air before I need to worry about the lee bow. That is just my case, maybe because i am sailing a 2-up boat solo.