This Broward, like so many of the same vintage had a cockpit extension at some stage in its career changing it from the original 94-106. I recently had an experience entering Ixtapa inlet in dead-calm weather where the stern went almost out of control, threatening to put us across the inlet, and that at about 1000RPM. My concern now is whether we are in for some nasty surprises in a real following sea. The props are 12-15'ahead of the stern and the extension was of a much lighter grade aluminium which seems to create buoyancy.Another concern is that a swim-platform is planned at the next haulout and could perhaps further exacerbate the condition, acting like a big fat trim-tab. Has anyone had a similar experience or have any thoughts on this issue? I was wondering about the addition of skegs.