Hi Eric,
Is it possible to get the console output for one of the IAP-305's being converted?
Does it says conversion successful when you try to convert them ?
Are the IAP's able to reach the controller in the new subnet ?
In case the conversaion fails, please collect the IAP to get more clue in to the issue.
Just to make sure there is no change on controller side, please verify the following outputs :
1. show ap license-usage -- This commans will tell you if you have licenses available
2. show datapath session table <ip of IAP>
The above command will tell you if there is any traffic seen from the IAP on the controller.
3. Do you have CPSEC enabled on the controller. If yes , please check the following command to see the IAP mac-address is present in the CPSEC whitelist:
show whitelist-db cpsec | include <mac-address of IAP>