Evangelos Kokkoris, "increasing the size when unlocking" #8, 27 Feb 2006 12:32 pmIt seems there is always an increase in size when the file is Reader Extended and another one when it is saved for the first time. Also, you will probably notice some file decrease after a second save, and then file size stabilizes.
Client side, this is partially addressed in Reader 7.0.5 and 7.0.7 updates, so make sure you have the latest update installed.
Try also avoid using non standard fonts in form fields. If the font needs to get embedded, it will significally increase the file size.
HTH,
Evangelos