Have you tried with the pump running and the return flow to the zone you are attempting to remove the heads from? The water pressure will help push the head out once it is rotated to the unlock position using the tool. My A&A heads sometimes stick and doing the above usually helps.
The other option for me was to swim down to the heads and use the removal tool. Wiggling the tool a bit seems to help too. Not fun when the water is cold though.
Another option would be to call Blue Square and ask their tech support. They are in Chandler and open from 7am to 3pm.