I didn't know what colors to put there so I just put neon colors there but thanks for the criticism.
Make a specials column. If you have a hard time deciding what kinds of colors to place, try asking other people to experiment with the colorset, and then give you feedback as to what colors yours is lacking. That's what I did with mine, and it worked rather well. Some of my special colors are my most useful.
Also, organize your colors a lot better. You have some nice browns, so try putting them together in a brownscale column.