seems funny, I would have thought that ADT would have their built in balloon callouts adjust to the drawing scale. Well, their is a couple things you could try, The ADT balloon is a block, you can try and recreate the block to the appropriate scale and as it is inserted, will default to the drawing block. It all comes down to how the Content block was created, if it bothers you a lot, you can recreate the block using the AECCREATECONTENT command. On the second page in this command dialog, their is a section for additional scaling. You may want to look into that.
