All the iap's are on trunk ports with the same native vlan (all the units got static address on that native)
So based on your post,i should configure the virtual ip address as 16.188.55.1,and set all the iap's of this group to be from 16.188.55.2-9 ? and not to use the 16.188.55.1 also for an IAP unit? (did i understood right?)
As long as the virtual controller assigen ip is not 0.0.0.0
am i right?