According to the math I used to get the draft for my weight ( which was pretty close), I'd say it would sink another 1 1/2". So, about 3" - 3 1/2" or so of freeboard. Doable, but not much leeway. More flair would give more initial freeboard than I have and sink even less with an additional 100 lbs. Bee, with your tumblehomes, and your flair, I think it would work for you.