Using "done signing" increases file size 3 to 5 times !

The new feature in Acrobat Reader 10.1.2 onwards is great - I can add a signature and a date.

BUT if I use "done signing" the file size increases 3 to 5 times the original file size !  So I used File Save - and that worked well.

Then I updated to 10.1.6 - and now the signature that I added is not "fixed" - it can be deleted or moved !

We don't want to use digital signatures !!

Any suggestions ?

Thanks