Larger foot pegs from black Dog Cycle Works. I wouldn't have thought that larger pegs would help that much, but it is much easier to control the bike. I can stand a lot longer without my feet hurting and there is a lot less vibration.
Standing on the stock pegs was like being on a tight rope. It was scary when they were wet or muddy. The wider pegs make a huge difference. You can actually feel comfortable putting pressure on the pegs to help steer.