Jay
I'm very sure foam between the bulkhead and the hull eases hard-lines. I use to sail a clipper marine and when you viewed down the hull while out of the water you could see faint lines created from the lack of soft material between the bulkhead and hull. There is a name for this but I'm at a loss for now.
Our Westsail did have foam strips installed (i removed them) but I'm just not sure what to use as a replacement or if its necessary so close to the fore-peak. I would defiantly install the foam between every other bulkhead on the boat.
Another detail I ponder is if I can use a foam core to make the bulkhead or simply stick to wood as a core? decisions decision - Sampson post removal easy, bulkhead details tricky!