I was just chatting with Esty, he was saying they add part to the boil, and then ferment down to within 5-6 points of final and add the rest and let it finish. So this gives me a good idea of what my grain bill should be.
So I'm thinking I will add a liter to the late boil, and maybe another liter after 3 days into ferment. I'd like it to be session-able, but not over powering on maple either. But maybe this is too much.