The disarm feat on whips is useless since they are small weapons and can not be equipped offhand with a larger weapon in the main hand. This results in a big AB penalty in most cases.
I would suggest to remove the disarm feat from all whips and give them slash + bludgeoning damage instead by adding bludgeoning as extra damage type. This would also fit to the weapon focus groups (one handed edged and concussion).
thanks!