The speed potions were changed to 30 seconds as we didn't want the kit to basically be the Samurai kit, also the purpose of the speed potions is to get a quick get away. The speed potions have been changed to drinkable rather than splash as players were sharing the speed potions with other players that don't have a kit with speed effects related to it. The poison has been changed back to 6 seconds as that was a case of miscommunication. And the armour has been reduced to protection 3 from 4 due to the Wizard due was rather unbalanced and tanky if compared to other kits.
The changes to the kits were mentioned to well known FFA players and they agreed with the changed and liked them, also other staff members. Plus 101_son mentioned the quick changes on the "PvP Mini Update" thread, which didn't return negative feedback.