With a heavy passenger, I actually notice more difference in the takeoff. If I use my normal solo technique of raising the tail a moderate amount and then just letting it fly off when its ready, with a pax it starts getting light on its feet before its ready to fly and it just dances around for a while. If there is any x-wind whatsoever during this dancing phase I find myself fighting to maintain centerline. So with a pax I change my T/O technique somewhat and lift the tail higher and keep it there longer to stay planted on the ground until its definitely ready to fly, then a little back pressure and we are smoothly off.